Anthem Medical Necessity Letter Template 2026 [Copy & Customize]

For general medical necessity letter guidance that applies across insurers, see the medical necessity justification letter guide. This guide covers the Anthem-specific criteria landscape that determines which rulebook a letter needs to cite.

Why a Generic Medical Necessity Letter Gets Rejected by Anthem

Anthem Blue Cross does not evaluate medical necessity against one uniform standard. Depending on the member's benefit plan, state affiliate, line of business, and review arrangement, a denial may cite plan or government-program terms, an Anthem Medical Policy or Clinical UM Guideline, licensed criteria such as InterQual or MCG, or a Carelon Medical Benefits Management Clinical Appropriateness Guideline. Treat those as possible sources, not a universal service-to-criteria map.

Beginning in 2026, CMS-0057-F requires impacted payers to provide a specific reason for a denied prior authorization. The requirement applies to non-drug prior authorization decisions by Medicare Advantage organizations, state Medicaid and CHIP fee-for-service programs, Medicaid and CHIP managed care entities, and Qualified Health Plan issuers on Federally-facilitated Exchanges. A specific reason is useful rebuttal material, but the rule does not promise that every response will quote an exact criterion or policy section.

How to Identify the Controlling Criteria

Anthem's ADMIN.00004 Medical Necessity Criteria describes a general medical-necessity framework, but it expressly warns that those criteria may not be the definition used in the covered individual's plan document and directs benefit determinations to the plan's specific contract language. Use ADMIN.00004 only when relevant; it does not override the controlling benefit plan or establish which review criteria apply to a particular request.

Anthem Medical Necessity Letter Template

Use this template as a starting point for a formal written medical necessity appeal. Replace its routing, deadline, criteria, and address fields with the instructions for the member's Anthem affiliate, plan, and line of business.

[Your Practice Letterhead]
[Date]

[Anthem Affiliate] Appeals Department
[Address from denial letter — do not use a general Anthem claims address]

RE: Medical Necessity Appeal
  Patient: [Name], DOB: [Date]
  Member ID: [Anthem Member ID]
  Claim/Authorization Number: [Number]
  Date of Service: [Date]
  Service: [Description], CPT/HCPCS: [Code]
  Diagnosis: [ICD-10 code and description]
  Denial Date: [Date]
  Criteria or Policy Cited in Denial: [Exact title/number/version, if supplied]
  Carelon/AIM Case or Order Number (if applicable): [Number]

Dear Anthem Appeals Reviewer,

I am writing to appeal the denial of the above-referenced claim on the basis of
medical necessity. This letter responds directly to the criteria cited in
Anthem's denial notice.

PATIENT CLINICAL PRESENTATION:

[Patient name] is a [age]-year-old [gender] with a diagnosis of [condition]
(ICD-10: [code]). Clinical presentation includes:

- Chief Complaint: [Specific symptoms]
- Duration of Symptoms: [Timeline]
- Severity: [Objective measures — pain scale, functional limitation, lab or imaging values]
- Previous Treatments: [List prior interventions, duration, and outcomes]

RESPONSE TO EACH CRITERION CITED IN THE DENIAL

[Identify the stated denial reason and any criteria supplied. Retain only a
section supported by the denial notice and current plan/program instructions;
delete the other examples. Do not supply an exact criterion the payer did not.]

If the denial cites an ANTHEM MEDICAL POLICY:
Per Anthem Medical Policy [number], titled "[Policy Name]," [service] is
covered when the following criteria are met:
Criterion 1: [exact criterion text] — met because [clinical explanation with evidence]
Criterion 2: [exact criterion text] — met because [clinical explanation with evidence]
[Continue for every criterion listed in the policy]

If the denial cites INTERQUAL:
Per InterQual [Level, e.g., Acute Adult Severity of Illness / Intensity of
Service], the following clinical indicators are documented in the patient's
record: [list each InterQual indicator and the specific chart evidence
meeting it].

If the denial cites MCG CARE GUIDELINES:
Per MCG [Guideline Title, edition], the requested level of care / service is
supported by: [list each MCG indicator and the specific chart evidence
meeting it]. [If behavioral health, address all applicable levels-of-care
criteria — inpatient, residential, PHP, IOP, or outpatient — as relevant.]

If the denial cites a CARELON MEDICAL BENEFITS MANAGEMENT GUIDELINE:
Per Carelon Clinical Appropriateness Guideline [title, version, section], the
requested service meets the following criteria: [list each supplied criterion and the
specific chart evidence meeting it, including conservative treatment
history where the guideline requires it].

CONSERVATIVE TREATMENT HISTORY (where applicable):

- [Treatment 1]: [Duration, outcome]
- [Treatment 2]: [Duration, outcome]

SUPPORTING CLINICAL EVIDENCE:

Per [clinical guideline source, e.g., a specialty society guideline or
peer-reviewed study], [clinical statement supporting the denied service].
This is consistent with the criteria cited above.

CLINICAL CONCLUSION:

[Patient name] meets the criteria cited in Anthem's denial notice for
[service]. Denial of this medically necessary service would be inconsistent
with the cited criteria and the patient's documented clinical needs. I am
available to discuss this case via peer-to-peer review at your convenience.

DOCUMENTATION ENCLOSED:
- Original denial notice
- Office/visit notes: [dates]
- Diagnostic test results (imaging, labs) as applicable
- Ordering/treating physician attestation
- Relevant clinical guideline excerpt or peer-reviewed citation

Respectfully,

[Signature]
[Provider Name, Credentials]
NPI: [Number] | Phone: [Number] | Fax: [Number]

Citing Each Criteria Set Correctly

Anthem Medical Policy

Anthem's Medical Policies address the medical necessity of certain services and procedures, while Clinical UM Guidelines can supply detailed selection criteria. Find the current materials at Anthem's Medical Policies and Clinical UM Guidelines library, but do not assume a search result governs the member. Confirm applicability from the denial notice, benefit plan, affiliate, and line of business before citing its exact number and section.

InterQual

Some Anthem affiliates and programs use InterQual in parts of their utilization-review hierarchy; others use different sources or sequences. Use InterQual only when the denial or current plan/program materials identify it. If an InterQual criterion is supplied, pair that exact indicator with the corresponding chart finding rather than relying on a general narrative.

MCG Care Guidelines

Some Anthem affiliates and lines of business use MCG criteria, sometimes only after plan, government-program, or Anthem-specific criteria are considered. Confirm the applicable hierarchy and edition in the current plan or affiliate materials. If the denial cites MCG, respond to the title, edition, and criterion actually supplied; do not infer MCG from the service category alone.

Carelon Medical Benefits Management Clinical Appropriateness Guidelines

Carelon Medical Benefits Management provides the clinical-review services formerly branded AIM Specialty Health across several specialty areas, but Carelon says covered services and program participation differ by health plan. If the denial or member materials route the case to Carelon, use the current provider portal or the plan-assigned number and follow the notice's consultation and appeal instructions. There is no universal 48-hour window or single phone number for every Anthem/Carelon program.

Frequently Asked Questions

Does Anthem use InterQual or MCG for medical necessity denials?

Anthem plans and affiliates may use InterQual, MCG, Anthem Medical Policies or Clinical UM Guidelines, Carelon MBM guidelines, and plan- or program-specific rules in different combinations and hierarchies. The service category alone does not determine which source controls. Check the denial notice, benefit plan, affiliate, and line of business; if the exact criteria are not supplied, request them before finalizing the letter.

Where do I find Anthem's Medical Policy for a specific service?

Go to Anthem's Medical Policies and Clinical UM Guidelines library and search by service or code. Then confirm that the result applies to the member's plan and line of business before citing the policy number and current version. If the denial names a different criteria source, follow the notice and plan materials instead.

What is Anthem's ADMIN.00004 Medical Necessity Criteria policy?

ADMIN.00004 describes Anthem's general medical-necessity framework. The policy also says its criteria may differ from the definition in a covered individual's plan and directs benefit determinations to that plan's specific contract language. It is therefore a reference point, not proof that a particular criteria product or policy controls the denial.

Do I need a peer-to-peer review before submitting a medical necessity letter?

Not always. Consultation or peer-to-peer availability, timing, eligible participants, and routing depend on the health plan and program. Follow the denial notice and current plan instructions. When Carelon MBM handled the review, use its provider portal or the plan-specific number; when Anthem handled it directly, use the contact route on the notice. Do not delay a formal appeal while pursuing an informal review unless the governing instructions preserve the appeal deadline.

Can I use this template for an Anthem Medicare Advantage plan?

Yes, with adjustments. For non-drug prior authorization denials, an Anthem Medicare Advantage organization is among the impacted payers that must provide a specific reason under CMS-0057-F. That does not guarantee an exact criterion citation. Use the reason and any criteria actually supplied, verify the appeal deadline and route on the notice, and see how to appeal Anthem denials for plan-type routing context.

What if this isn't a medical necessity denial — it's a billing or eligibility issue?

This template is scoped to medical necessity denials specifically. For other denial reasons — timely filing, eligibility, coordination of benefits, or coding disputes — see how to appeal Anthem denials for plan-specific routing and the Anthem appeal letter template for the general Level 1 appeal process.

What if the denial notice doesn't name a specific criterion?

Address the specific reason the denial provides, then request the applicable criteria in writing. CMS-0057-F's 2026 notice rule is limited to non-drug prior authorization denials by impacted payers and requires a specific reason, not necessarily an exact criterion citation. Use the contact route on the notice or member materials; for a Carelon-managed case, follow the Carelon portal or plan-specific contact instructions.

Ready to Appeal an Anthem Medical Necessity Denial?

The highest-leverage preparation step is identifying the denial's stated reason and the criteria that actually control for this member's plan, affiliate, and line of business. Do not substitute a generic medical-necessity narrative or a service-based guess for the governing materials.

Before you submit:

• Read the denial notice for the stated reason and any named policy or criteria
• Confirm applicability against the benefit plan, affiliate, and line of business
• Request the specific criteria in writing if they are not supplied; do not invent a citation
• Respond to every cited criterion individually, with matching chart evidence
• Follow notice-specific consultation, peer-to-peer, and appeal directions without assuming a fixed Carelon window or phone number
• Follow the submission route controlled by the denial notice and current plan instructions; examples include Availity, a delegated-review portal, a specific fax number, or a mailing address

Start 3 Free Appeals →

Use this as a starting point in any Anthem affiliate state, then apply the member-specific plan and program instructions.

This guide reflects 2026 Anthem Blue Cross Blue Shield medical necessity criteria and appeal procedures. Criteria sets, policy numbers, and guideline editions vary by affiliate, plan, and service and are updated without advance notice. Always verify the specific criteria cited against the current denial notice before submitting. This guide does not constitute legal or clinical advice.