CPT 70473: ICD-10 codes that support medical necessity
These ICD-10-CM diagnoses support medical necessity for CPT 70473 under Medicare coverage policies (LCDs, NCDs, and Billing & Coding articles). Billing CPT 70473 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 |
|---|---|
| G43.401 | Hemiplegic migraine, not intractable, with status migrainosus |
| G43.409 | Hemiplegic migraine, not intractable, without status migrainosus |
| G43.411 | Hemiplegic migraine, intractable, with status migrainosus |
| G43.419 | Hemiplegic migraine, intractable, without status migrainosus |
| G44.53 | Primary thunderclap headache |
| G45.1 | Carotid artery syndrome (hemispheric) |
| G46.0 | Middle cerebral artery syndrome |
| G81.01 | Flaccid hemiplegia affecting right dominant side |
| G81.02 | Flaccid hemiplegia affecting left dominant side |
| G81.03 | Flaccid hemiplegia affecting right nondominant side |
| G81.04 | Flaccid hemiplegia affecting left nondominant side |
| G81.91 | Hemiplegia, unspecified affecting right dominant side |
| G81.92 | Hemiplegia, unspecified affecting left dominant side |
| G81.93 | Hemiplegia, unspecified affecting right nondominant side |
| G81.94 | Hemiplegia, unspecified affecting left nondominant side |
| G83.84 | Todd's paralysis (postepileptic) |
| H53.131 | Sudden visual loss, right eye |
| H53.132 | Sudden visual loss, left eye |
| H53.133 | Sudden visual loss, bilateral |
| H53.139 | Sudden visual loss, unspecified eye |
| H53.8 | Other visual disturbances |
| H53.9 | Unspecified visual disturbance |
| I63.031 | Cerebral infarction due to thrombosis of right carotid artery |
| I63.032 | Cerebral infarction due to thrombosis of left carotid artery |
| I63.131 | Cerebral infarction due to embolism of right carotid artery |
| I63.132 | Cerebral infarction due to embolism of left carotid artery |
| I63.231 | Cerebral infarction due to unspecified occlusion or stenosis of right carotid arteries |
| I63.232 | Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries |
| I63.311 | Cerebral infarction due to thrombosis of right middle cerebral artery |
| I63.312 | Cerebral infarction due to thrombosis of left middle cerebral artery |
| I63.411 | Cerebral infarction due to embolism of right middle cerebral artery |
| I63.412 | Cerebral infarction due to embolism of left middle cerebral artery |
| I63.511 | Cerebral infarction due to unspecified occlusion or stenosis of right middle cerebral artery |
| I63.512 | Cerebral infarction due to unspecified occlusion or stenosis of left middle cerebral artery |
| I69.320 | Aphasia following cerebral infarction |
| I69.321 | Dysphasia following cerebral infarction |
| I69.322 | Dysarthria following cerebral infarction |
| I69.323 | Fluency disorder following cerebral infarction |
| I69.344 | Monoplegia of lower limb following cerebral infarction affecting left non-dominant side |
| I69.351 | Hemiplegia and hemiparesis following cerebral infarction affecting right dominant side |
| I69.352 | Hemiplegia and hemiparesis following cerebral infarction affecting left dominant side |
| I69.353 | Hemiplegia and hemiparesis following cerebral infarction affecting right non-dominant side |
| I69.354 | Hemiplegia and hemiparesis following cerebral infarction affecting left non-dominant side |
| I69.992 | Facial weakness following unspecified cerebrovascular disease |
| R26.0 | Ataxic gait |
| R26.2 | Difficulty in walking, not elsewhere classified |
| R27.8 | Other lack of coordination |
| R27.9 | Unspecified lack of coordination |
| R29.810 | Facial weakness |
| R41.4 | Neurologic neglect syndrome |
| R47.01 | Aphasia |
| R47.02 | Dysphasia |
| R47.1 | Dysarthria and anarthria |
| R47.81 | Slurred speech |
| R47.89 | Other speech disturbances |
| R47.9 | Unspecified speech disturbances |
Frequently asked questions
Which ICD-10 codes support medical necessity for CPT 70473?
Medicare coverage policies (LCDs/NCDs and Billing & Coding articles) list 56 ICD-10 diagnosis codes that support medical necessity for CPT 70473. 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 70473 view of that relationship.
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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