CARC 170 Denial Appeal

Denied for provider type

Payment is denied when performed/billed by this type of provider. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.

The winning argument

The rendering clinician is a state-licensed provider type authorized to perform the billed psychotherapy service, and federal policy now expressly recognizes master's-level behavioral-health clinicians — Medicare enrolls and independently pays marriage and family therapists and mental health counselors effective January 1, 2024 — so a provider-type denial resting on outdated edits, a provider-file mismatch, or credentialing standards applied more stringently to mental-health clinicians than to comparable medical/surgical providers is misapplied and, for commercial plans, functions as a network-composition NQTL under MHPAEA. The payer should produce the specific written policy provision and the provider type/taxonomy it assigned in adjudication.

• CMS policy permits behavioral-health services furnished by auxiliary personnel such as LPCs and LMFTs under the general supervision of a physician or non-physician practitioner, billed incident-to (42 CFR 410.26); where the claim used a compliant supervised-billing structure, the provider-type edit was misapplied.
• Under the federal parity regulations' illustrative NQTL list, standards related to network composition — including standards for provider admission to a network, credentialing standards, and methods for determining reimbursement rates — may be applied no more stringently to mental-health benefits than to medical/surgical benefits, and plans imposing NQTLs must perform and produce comparative analyses on request under the CAA, 2021.
• The code's own X12 definition directs payers to identify the governing policy (835 Healthcare Policy Identification Segment); the payer should therefore identify the exact policy provision relied upon so the determination can be checked against the clinician's actual license, credentialing status, and the payer's published provider manual.
• If the root cause is a provider-file or taxonomy mismatch (e.g., rendering vs. supervising NPI, or an outdated taxonomy on file) rather than a true coverage rule, the claim should be reprocessed with corrected provider information rather than denied.

Sample appeal letter body

Replace the {{placeholders}} with your own information before sending.

We are appealing the denial of CPT {{service_code}} for {{patient_reference}}, denied under CARC 170 (payment is denied when performed/billed by this type of provider). The rendering clinician, {{clinician_name}}, {{clinician_credential}}, holds an active {{state}} license authorizing the billed psychotherapy service, and the claim was submitted consistent with your published credentialing and supervised-billing requirements ({{billing_structure}}). Federal policy recognizes master's-level behavioral-health clinicians as payable provider types: effective January 1, 2024, Medicare enrolls marriage and family therapists and mental health counselors and pays them independently for the diagnosis and treatment of mental illness, and CMS separately permits behavioral-health services furnished by auxiliary personnel such as licensed professional counselors and LMFTs under general supervision, billed incident to a physician or non-physician practitioner (42 CFR 410.26). To the extent this denial rests on provider-type, credentialing, or network-admission standards applied more stringently to mental-health clinicians than to comparable medical/surgical providers, those standards are nonquantitative treatment limitations subject to the Mental Health Parity and Addiction Equity Act (29 CFR 2590.712(c)(4)). We request the specific written policy provision relied upon, the provider type and taxonomy code your system assigned during adjudication, and reprocessing of this claim.