CARC 11 appeal letter template — Diagnosis Inconsistent with Procedure
CARC 11 means the payer determined the submitted diagnosis code does not support or align with the billed procedure code. This template helps staff appeal when documentation shows the diagnosis and procedure were appropriately linked.
When to appeal vs. correct & resubmit
Appeal CARC 11 when the medical record clearly supports the medical necessity and clinical relationship between the diagnosis and procedure billed, or when a coding/clerical error caused a mismatch that can be clarified with documentation. If an actual coding error occurred (e.g., wrong ICD-10 or CPT code was submitted), correct and resubmit a clean claim instead of appealing.
Appeal letter template
Copy the template, replace every [bracketed] field with your details, and keep only the paragraph that fits your situation.
[Date] [Payer Name] Attn: Appeals Department [Payer Address] Re: Appeal of Denial — CARC 11 (Diagnosis Inconsistent with Procedure) Patient Name: [Patient Name] Member ID: [Member ID] Claim #: [Claim #] Date(s) of Service: [DOS] Billed Procedure/Service: [CPT/HCPCS] Rendering Provider: [Provider Name, NPI] Dear Appeals Review Team, We are writing to formally appeal the denial of the above-referenced claim, which was denied under CARC 11, indicating that the diagnosis is inconsistent with the procedure billed. After review of the medical record and clinical documentation for this encounter, we believe the diagnosis code(s) submitted are clinically appropriate and directly support the medical necessity of the procedure performed. The attached documentation details the clinical findings, assessment, and rationale that connect the diagnosis to the service rendered on [DOS]. We respectfully request that [Payer Name] re-review this claim in light of the enclosed records. If any additional clarification, coding detail, or supporting documentation is needed to complete this review, please contact our office at [Phone] or [Email]. We appreciate your time and attention to this matter and look forward to a reconsideration of this claim. Sincerely, [Provider Name, NPI] [Practice/Facility Name] [Phone] [Email]
What to attach
- Copy of the original claim (EOB/ERA showing CARC 11 denial)
- Relevant medical records/progress notes supporting the diagnosis-procedure relationship
- Physician's clinical rationale or letter of medical necessity, if applicable
- Itemized statement or coding summary for the date(s) of service
- Any applicable prior authorization or referral documentation
Frequently asked questions
What does CARC 11 mean?
CARC 11 indicates the payer's system or reviewer determined the diagnosis code submitted does not logically support or justify the procedure billed.
Should I always appeal a CARC 11 denial?
No. If review confirms the diagnosis or procedure code was entered incorrectly, it's typically faster to correct the code and resubmit a clean claim rather than appeal.
What documentation helps most with this appeal?
Clinical notes that clearly describe the patient's condition and explain why the specific procedure was medically appropriate for that diagnosis are most helpful.
Can this denial happen due to a clerical error?
Yes, a simple transposition or outdated code can trigger CARC 11; verifying the codes before appealing can save time.
More free billing tools: all appeal letters · denial codes · NCCI edits · Medicare fees
This template is provided for informational purposes only and does not constitute legal, medical, or billing advice. It is a general framework to be customized based on your specific payer requirements and documentation. Use of this template does not guarantee that an appeal will be successful or that a denial will be overturned.
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