ICD↔CPT crosswalk
CPT 11646: ICD-10 codes that support medical necessity
These ICD-10-CM diagnoses support medical necessity for CPT 11646 under Medicare coverage policies (LCDs, NCDs, and Billing & Coding articles). Billing CPT 11646 with a diagnosis that isn't covered typically denies as CARC 50 — not medically necessary.
National approximation. Coverage varies by MAC and state — confirm against the specific LCD/NCD and article that applies to your jurisdiction and date of service.
| ICD-10 | Description |
|---|---|
| C00.0 | Malignant neoplasm of external upper lip |
| C00.1 | Malignant neoplasm of external lower lip |
| C00.2 | Malignant neoplasm of external lip, unspecified |
| C00.3 | Malignant neoplasm of upper lip, inner aspect |
| C00.4 | Malignant neoplasm of lower lip, inner aspect |
| C00.5 | Malignant neoplasm of lip, unspecified, inner aspect |
| C00.6 | Malignant neoplasm of commissure of lip, unspecified |
| C00.8 | Malignant neoplasm of overlapping sites of lip |
| C00.9 | Malignant neoplasm of lip, unspecified |
| C01 | Malignant neoplasm of base of tongue |
| C02.0 | Malignant neoplasm of dorsal surface of tongue |
| C02.1 | Malignant neoplasm of border of tongue |
| C02.2 | Malignant neoplasm of ventral surface of tongue |
| C02.3 | Malignant neoplasm of anterior two-thirds of tongue, part unspecified |
| C02.4 | Malignant neoplasm of lingual tonsil |
| C02.8 | Malignant neoplasm of overlapping sites of tongue |
| C02.9 | Malignant neoplasm of tongue, unspecified |
| C03.0 | Malignant neoplasm of upper gum |
| C03.1 | Malignant neoplasm of lower gum |
| C03.9 | Malignant neoplasm of gum, unspecified |
| C04.0 | Malignant neoplasm of anterior floor of mouth |
| C04.1 | Malignant neoplasm of lateral floor of mouth |
| C04.8 | Malignant neoplasm of overlapping sites of floor of mouth |
| C04.9 | Malignant neoplasm of floor of mouth, unspecified |
| C05.0 | Malignant neoplasm of hard palate |
| C05.1 | Malignant neoplasm of soft palate |
| C05.2 | Malignant neoplasm of uvula |
| C05.8 | Malignant neoplasm of overlapping sites of palate |
| C05.9 | Malignant neoplasm of palate, unspecified |
| C06.0 | Malignant neoplasm of cheek mucosa |
| C06.1 | Malignant neoplasm of vestibule of mouth |
| C06.2 | Malignant neoplasm of retromolar area |
| C06.80 | Malignant neoplasm of overlapping sites of unspecified parts of mouth |
| C06.89 | Malignant neoplasm of overlapping sites of other parts of mouth |
| C06.9 | Malignant neoplasm of mouth, unspecified |
| C07 | Malignant neoplasm of parotid gland |
| C08.0 | Malignant neoplasm of submandibular gland |
| C08.1 | Malignant neoplasm of sublingual gland |
| C08.9 | Malignant neoplasm of major salivary gland, unspecified |
| C09.0 | Malignant neoplasm of tonsillar fossa |
| C09.1 | Malignant neoplasm of tonsillar pillar (anterior) (posterior) |
| C09.8 | Malignant neoplasm of overlapping sites of tonsil |
| C09.9 | Malignant neoplasm of tonsil, unspecified |
| C10.0 | Malignant neoplasm of vallecula |
| C10.1 | Malignant neoplasm of anterior surface of epiglottis |
| C10.2 | Malignant neoplasm of lateral wall of oropharynx |
| C10.3 | Malignant neoplasm of posterior wall of oropharynx |
| C10.4 | Malignant neoplasm of branchial cleft |
| C10.8 | Malignant neoplasm of overlapping sites of oropharynx |
| C10.9 | Malignant neoplasm of oropharynx, unspecified |
| C11.0 | Malignant neoplasm of superior wall of nasopharynx |
| C11.1 | Malignant neoplasm of posterior wall of nasopharynx |
| C11.2 | Malignant neoplasm of lateral wall of nasopharynx |
| C11.3 | Malignant neoplasm of anterior wall of nasopharynx |
| C11.8 | Malignant neoplasm of overlapping sites of nasopharynx |
| C11.9 | Malignant neoplasm of nasopharynx, unspecified |
| C12 | Malignant neoplasm of pyriform sinus |
| C13.0 | Malignant neoplasm of postcricoid region |
| C13.1 | Malignant neoplasm of aryepiglottic fold, hypopharyngeal aspect |
| C13.2 | Malignant neoplasm of posterior wall of hypopharynx |
| C13.8 | Malignant neoplasm of overlapping sites of hypopharynx |
| C13.9 | Malignant neoplasm of hypopharynx, unspecified |
| C14.0 | Malignant neoplasm of pharynx, unspecified |
| C14.2 | Malignant neoplasm of Waldeyer's ring |
| C14.8 | Malignant neoplasm of overlapping sites of lip, oral cavity and pharynx |
| C43.0 | Malignant melanoma of lip |
| C43.10 | Malignant melanoma of unspecified eyelid, including canthus |
| C43.111 | Malignant melanoma of right upper eyelid, including canthus |
| C43.112 | Malignant melanoma of right lower eyelid, including canthus |
| C43.121 | Malignant melanoma of left upper eyelid, including canthus |
| C43.122 | Malignant melanoma of left lower eyelid, including canthus |
| C43.20 | Malignant melanoma of unspecified ear and external auricular canal |
| C43.21 | Malignant melanoma of right ear and external auricular canal |
| C43.22 | Malignant melanoma of left ear and external auricular canal |
| C43.30 | Malignant melanoma of unspecified part of face |
| C43.31 | Malignant melanoma of nose |
| C43.39 | Malignant melanoma of other parts of face |
| C43.4 | Malignant melanoma of scalp and neck |
| C43.51 | Malignant melanoma of anal skin |
| C43.52 | Malignant melanoma of skin of breast |
| C43.59 | Malignant melanoma of other part of trunk |
| C43.60 | Malignant melanoma of unspecified upper limb, including shoulder |
| C43.61 | Malignant melanoma of right upper limb, including shoulder |
| C43.62 | Malignant melanoma of left upper limb, including shoulder |
| C43.70 | Malignant melanoma of unspecified lower limb, including hip |
| C43.71 | Malignant melanoma of right lower limb, including hip |
| C43.72 | Malignant melanoma of left lower limb, including hip |
| C43.8 | Malignant melanoma of overlapping sites of skin |
| C44.00 | Unspecified malignant neoplasm of skin of lip |
| C44.01 | Basal cell carcinoma of skin of lip |
| C44.02 | Squamous cell carcinoma of skin of lip |
| C44.09 | Other specified malignant neoplasm of skin of lip |
| C44.101 | Unspecified malignant neoplasm of skin of unspecified eyelid, including canthus |
| C44.1021 | Unspecified malignant neoplasm of skin of right upper eyelid, including canthus |
| C44.1022 | Unspecified malignant neoplasm of skin of right lower eyelid, including canthus |
| C44.1091 | Unspecified malignant neoplasm of skin of left upper eyelid, including canthus |
| C44.1092 | Unspecified malignant neoplasm of skin of left lower eyelid, including canthus |
| C44.111 | Basal cell carcinoma of skin of unspecified eyelid, including canthus |
| C44.1121 | Basal cell carcinoma of skin of right upper eyelid, including canthus |
| C44.1122 | Basal cell carcinoma of skin of right lower eyelid, including canthus |
| C44.1191 | Basal cell carcinoma of skin of left upper eyelid, including canthus |
| C44.1192 | Basal cell carcinoma of skin of left lower eyelid, including canthus |
| C44.121 | Squamous cell carcinoma of skin of unspecified eyelid, including canthus |
| C44.1221 | Squamous cell carcinoma of skin of right upper eyelid, including canthus |
| C44.1222 | Squamous cell carcinoma of skin of right lower eyelid, including canthus |
| C44.1291 | Squamous cell carcinoma of skin of left upper eyelid, including canthus |
| C44.1292 | Squamous cell carcinoma of skin of left lower eyelid, including canthus |
| C44.131 | Sebaceous cell carcinoma of skin of unspecified eyelid, including canthus |
| C44.1321 | Sebaceous cell carcinoma of skin of right upper eyelid, including canthus |
| C44.1322 | Sebaceous cell carcinoma of skin of right lower eyelid, including canthus |
| C44.1391 | Sebaceous cell carcinoma of skin of left upper eyelid, including canthus |
| C44.1392 | Sebaceous cell carcinoma of skin of left lower eyelid, including canthus |
| C44.191 | Other specified malignant neoplasm of skin of unspecified eyelid, including canthus |
| C44.1921 | Other specified malignant neoplasm of skin of right upper eyelid, including canthus |
| C44.1922 | Other specified malignant neoplasm of skin of right lower eyelid, including canthus |
| C44.1991 | Other specified malignant neoplasm of skin of left upper eyelid, including canthus |
| C44.1992 | Other specified malignant neoplasm of skin of left lower eyelid, including canthus |
| C44.201 | Unspecified malignant neoplasm of skin of unspecified ear and external auricular canal |
| C44.202 | Unspecified malignant neoplasm of skin of right ear and external auricular canal |
| C44.209 | Unspecified malignant neoplasm of skin of left ear and external auricular canal |
| C44.211 | Basal cell carcinoma of skin of unspecified ear and external auricular canal |
| C44.212 | Basal cell carcinoma of skin of right ear and external auricular canal |
| C44.219 | Basal cell carcinoma of skin of left ear and external auricular canal |
| C44.221 | Squamous cell carcinoma of skin of unspecified ear and external auricular canal |
| C44.222 | Squamous cell carcinoma of skin of right ear and external auricular canal |
| C44.229 | Squamous cell carcinoma of skin of left ear and external auricular canal |
| C44.291 | Other specified malignant neoplasm of skin of unspecified ear and external auricular canal |
| C44.292 | Other specified malignant neoplasm of skin of right ear and external auricular canal |
| C44.299 | Other specified malignant neoplasm of skin of left ear and external auricular canal |
| C44.300 | Unspecified malignant neoplasm of skin of unspecified part of face |
| C44.301 | Unspecified malignant neoplasm of skin of nose |
| C44.309 | Unspecified malignant neoplasm of skin of other parts of face |
| C44.310 | Basal cell carcinoma of skin of unspecified parts of face |
| C44.311 | Basal cell carcinoma of skin of nose |
| C44.319 | Basal cell carcinoma of skin of other parts of face |
| C44.320 | Squamous cell carcinoma of skin of unspecified parts of face |
| C44.321 | Squamous cell carcinoma of skin of nose |
| C44.329 | Squamous cell carcinoma of skin of other parts of face |
| C44.390 | Other specified malignant neoplasm of skin of unspecified parts of face |
| C44.391 | Other specified malignant neoplasm of skin of nose |
| C44.399 | Other specified malignant neoplasm of skin of other parts of face |
| C44.40 | Unspecified malignant neoplasm of skin of scalp and neck |
| C44.41 | Basal cell carcinoma of skin of scalp and neck |
| C44.42 | Squamous cell carcinoma of skin of scalp and neck |
| C44.49 | Other specified malignant neoplasm of skin of scalp and neck |
| C44.500 | Unspecified malignant neoplasm of anal skin |
| C44.501 | Unspecified malignant neoplasm of skin of breast |
| C44.509 | Unspecified malignant neoplasm of skin of other part of trunk |
| C44.510 | Basal cell carcinoma of anal skin |
| C44.511 | Basal cell carcinoma of skin of breast |
| C44.519 | Basal cell carcinoma of skin of other part of trunk |
| C44.520 | Squamous cell carcinoma of anal skin |
| C44.521 | Squamous cell carcinoma of skin of breast |
| C44.529 | Squamous cell carcinoma of skin of other part of trunk |
| C44.590 | Other specified malignant neoplasm of anal skin |
| C44.591 | Other specified malignant neoplasm of skin of breast |
| C44.599 | Other specified malignant neoplasm of skin of other part of trunk |
| C44.601 | Unspecified malignant neoplasm of skin of unspecified upper limb, including shoulder |
| C44.602 | Unspecified malignant neoplasm of skin of right upper limb, including shoulder |
| C44.609 | Unspecified malignant neoplasm of skin of left upper limb, including shoulder |
| C44.611 | Basal cell carcinoma of skin of unspecified upper limb, including shoulder |
| C44.612 | Basal cell carcinoma of skin of right upper limb, including shoulder |
| C44.619 | Basal cell carcinoma of skin of left upper limb, including shoulder |
| C44.621 | Squamous cell carcinoma of skin of unspecified upper limb, including shoulder |
| C44.622 | Squamous cell carcinoma of skin of right upper limb, including shoulder |
| C44.629 | Squamous cell carcinoma of skin of left upper limb, including shoulder |
| C44.691 | Other specified malignant neoplasm of skin of unspecified upper limb, including shoulder |
| C44.692 | Other specified malignant neoplasm of skin of right upper limb, including shoulder |
| C44.699 | Other specified malignant neoplasm of skin of left upper limb, including shoulder |
| C44.701 | Unspecified malignant neoplasm of skin of unspecified lower limb, including hip |
| C44.702 | Unspecified malignant neoplasm of skin of right lower limb, including hip |
| C44.709 | Unspecified malignant neoplasm of skin of left lower limb, including hip |
| C44.711 | Basal cell carcinoma of skin of unspecified lower limb, including hip |
| C44.712 | Basal cell carcinoma of skin of right lower limb, including hip |
| C44.719 | Basal cell carcinoma of skin of left lower limb, including hip |
| C44.721 | Squamous cell carcinoma of skin of unspecified lower limb, including hip |
| C44.722 | Squamous cell carcinoma of skin of right lower limb, including hip |
| C44.729 | Squamous cell carcinoma of skin of left lower limb, including hip |
| C44.791 | Other specified malignant neoplasm of skin of unspecified lower limb, including hip |
| C44.792 | Other specified malignant neoplasm of skin of right lower limb, including hip |
| C44.799 | Other specified malignant neoplasm of skin of left lower limb, including hip |
| C44.80 | Unspecified malignant neoplasm of overlapping sites of skin |
| C44.81 | Basal cell carcinoma of overlapping sites of skin |
| C44.82 | Squamous cell carcinoma of overlapping sites of skin |
| C44.89 | Other specified malignant neoplasm of overlapping sites of skin |
| C4A.0 | Merkel cell carcinoma of lip |
| C4A.10 | Merkel cell carcinoma of unspecified eyelid, including canthus |
| C4A.111 | Merkel cell carcinoma of right upper eyelid, including canthus |
| C4A.112 | Merkel cell carcinoma of right lower eyelid, including canthus |
| C4A.121 | Merkel cell carcinoma of left upper eyelid, including canthus |
| C4A.122 | Merkel cell carcinoma of left lower eyelid, including canthus |
| C4A.20 | Merkel cell carcinoma of unspecified ear and external auricular canal |
| C4A.21 | Merkel cell carcinoma of right ear and external auricular canal |
| C4A.22 | Merkel cell carcinoma of left ear and external auricular canal |
| C4A.30 | Merkel cell carcinoma of unspecified part of face |
| C4A.31 | Merkel cell carcinoma of nose |
| C4A.39 | Merkel cell carcinoma of other parts of face |
| C4A.4 | Merkel cell carcinoma of scalp and neck |
| C4A.51 | Merkel cell carcinoma of anal skin |
| C4A.52 | Merkel cell carcinoma of skin of breast |
| C4A.59 | Merkel cell carcinoma of other part of trunk |
| C4A.60 | Merkel cell carcinoma of unspecified upper limb, including shoulder |
| C4A.61 | Merkel cell carcinoma of right upper limb, including shoulder |
| C4A.62 | Merkel cell carcinoma of left upper limb, including shoulder |
| C4A.70 | Merkel cell carcinoma of unspecified lower limb, including hip |
| C4A.71 | Merkel cell carcinoma of right lower limb, including hip |
| C4A.72 | Merkel cell carcinoma of left lower limb, including hip |
| C4A.8 | Merkel cell carcinoma of overlapping sites |
| C4A.9 | Merkel cell carcinoma, unspecified |
| C51.0 | Malignant neoplasm of labium majus |
| C51.1 | Malignant neoplasm of labium minus |
| C51.2 | Malignant neoplasm of clitoris |
| C51.8 | Malignant neoplasm of overlapping sites of vulva |
| C51.9 | Malignant neoplasm of vulva, unspecified |
| C52 | Malignant neoplasm of vagina |
| C57.7 | Malignant neoplasm of other specified female genital organs |
| C57.8 | Malignant neoplasm of overlapping sites of female genital organs |
| C60.0 | Malignant neoplasm of prepuce |
| C60.1 | Malignant neoplasm of glans penis |
| C60.2 | Malignant neoplasm of body of penis |
| C60.8 | Malignant neoplasm of overlapping sites of penis |
| C60.9 | Malignant neoplasm of penis, unspecified |
| C63.2 | Malignant neoplasm of scrotum |
| C76.0 | Malignant neoplasm of head, face and neck |
| C76.1 | Malignant neoplasm of thorax |
| C76.2 | Malignant neoplasm of abdomen |
| C76.3 | Malignant neoplasm of pelvis |
| C76.40 | Malignant neoplasm of unspecified upper limb |
| C76.41 | Malignant neoplasm of right upper limb |
| C76.42 | Malignant neoplasm of left upper limb |
| C76.50 | Malignant neoplasm of unspecified lower limb |
| C76.51 | Malignant neoplasm of right lower limb |
| C76.52 | Malignant neoplasm of left lower limb |
| C76.8 | Malignant neoplasm of other specified ill-defined sites |
| C79.2 | Secondary malignant neoplasm of skin |
| C79.81 | Secondary malignant neoplasm of breast |
| C79.82 | Secondary malignant neoplasm of genital organs |
| D00.00 | Carcinoma in situ of oral cavity, unspecified site |
| D00.01 | Carcinoma in situ of labial mucosa and vermilion border |
| D00.02 | Carcinoma in situ of buccal mucosa |
| D00.03 | Carcinoma in situ of gingiva and edentulous alveolar ridge |
| D00.04 | Carcinoma in situ of soft palate |
| D00.05 | Carcinoma in situ of hard palate |
| D00.06 | Carcinoma in situ of floor of mouth |
| D00.07 | Carcinoma in situ of tongue |
| D00.08 | Carcinoma in situ of pharynx |
| D03.0 | Melanoma in situ of lip |
| D03.10 | Melanoma in situ of unspecified eyelid, including canthus |
| D03.111 | Melanoma in situ of right upper eyelid, including canthus |
| D03.112 | Melanoma in situ of right lower eyelid, including canthus |
| D03.121 | Melanoma in situ of left upper eyelid, including canthus |
| D03.122 | Melanoma in situ of left lower eyelid, including canthus |
| D03.20 | Melanoma in situ of unspecified ear and external auricular canal |
| D03.21 | Melanoma in situ of right ear and external auricular canal |
| D03.22 | Melanoma in situ of left ear and external auricular canal |
| D03.30 | Melanoma in situ of unspecified part of face |
| D03.39 | Melanoma in situ of other parts of face |
| D03.4 | Melanoma in situ of scalp and neck |
| D03.51 | Melanoma in situ of anal skin |
| D03.52 | Melanoma in situ of breast (skin) (soft tissue) |
| D03.59 | Melanoma in situ of other part of trunk |
| D03.60 | Melanoma in situ of unspecified upper limb, including shoulder |
| D03.61 | Melanoma in situ of right upper limb, including shoulder |
| D03.62 | Melanoma in situ of left upper limb, including shoulder |
| D03.70 | Melanoma in situ of unspecified lower limb, including hip |
| D03.71 | Melanoma in situ of right lower limb, including hip |
| D03.72 | Melanoma in situ of left lower limb, including hip |
| D03.8 | Melanoma in situ of other sites |
| D04.0 | Carcinoma in situ of skin of lip |
| D04.10 | Carcinoma in situ of skin of unspecified eyelid, including canthus |
| D04.111 | Carcinoma in situ of skin of right upper eyelid, including canthus |
| D04.112 | Carcinoma in situ of skin of right lower eyelid, including canthus |
| D04.121 | Carcinoma in situ of skin of left upper eyelid, including canthus |
| D04.122 | Carcinoma in situ of skin of left lower eyelid, including canthus |
| D04.20 | Carcinoma in situ of skin of unspecified ear and external auricular canal |
| D04.21 | Carcinoma in situ of skin of right ear and external auricular canal |
| D04.22 | Carcinoma in situ of skin of left ear and external auricular canal |
| D04.30 | Carcinoma in situ of skin of unspecified part of face |
| D04.39 | Carcinoma in situ of skin of other parts of face |
| D04.4 | Carcinoma in situ of skin of scalp and neck |
| D04.5 | Carcinoma in situ of skin of trunk |
| D04.60 | Carcinoma in situ of skin of unspecified upper limb, including shoulder |
| D04.61 | Carcinoma in situ of skin of right upper limb, including shoulder |
| D04.62 | Carcinoma in situ of skin of left upper limb, including shoulder |
| D04.70 | Carcinoma in situ of skin of unspecified lower limb, including hip |
| D04.71 | Carcinoma in situ of skin of right lower limb, including hip |
| D04.72 | Carcinoma in situ of skin of left lower limb, including hip |
| D04.8 | Carcinoma in situ of skin of other sites |
| D07.1 | Carcinoma in situ of vulva |
| D07.2 | Carcinoma in situ of vagina |
| D07.30 | Carcinoma in situ of unspecified female genital organs |
| D07.39 | Carcinoma in situ of other female genital organs |
| D07.4 | Carcinoma in situ of penis |
| D07.60 | Carcinoma in situ of unspecified male genital organs |
| D07.61 | Carcinoma in situ of scrotum |
| D07.69 | Carcinoma in situ of other male genital organs |
| D48.5 | Neoplasm of uncertain behavior of skin |
Frequently asked questions
Which ICD-10 codes support medical necessity for CPT 11646?
Medicare coverage policies (LCDs/NCDs and Billing & Coding articles) list 297 ICD-10 diagnosis codes that support medical necessity for CPT 11646. The covered codes are listed on this page. Coverage varies by MAC/state — always confirm against the policy that applies to you.
What is a medical-necessity (LCD/NCD) crosswalk?
A claim whose procedure isn't supported by a covered diagnosis denies as "not medically necessary" (CARC 50). CMS coverage policies define which diagnoses justify a procedure; this page is the ICD-10 → CPT 11646 view of that relationship.
Catch medical-necessity denials before you bill. CareNiva scrubs claims against LCD/NCD coverage and flags unsupported diagnoses — in the same platform you run visits and billing.
More free billing tools: all crosswalks · NCCI edits · Medicare fees · denial codes
Informational only, not coding, billing, or legal advice. Based on CMS Medicare Coverage Database data; verify the current LCD/NCD for your MAC before billing.
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