C47.8
BillableMalignant neoplasm of overlapping sites of peripheral nerves and autonomic nervous system
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C47.8 an HCC code?
Yes. C47.8 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model (and Lymphoma and Other Cancers under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for C47.8
For C47.8 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed C47.8 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C47.8 is the ICD-10-CM diagnosis code for malignant neoplasm of overlapping sites of peripheral nerves and autonomic nervous system. Cancer that involves multiple overlapping sites of the peripheral nerves and autonomic nervous system. This code is used when the tumor spans more than one distinct nerve region. C47.8 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of mesothelial and soft tissue (c45-c49).
Under the CMS-HCC V28 risk adjustment model, C47.8 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors (HCC 21) with a community, non-dual, aged base RAF weight of 0.545. Under the older CMS-HCC V24 model, C47.8 maps to Lymphoma and Other Cancers (HCC 10) with a community, non-dual, aged base RAF weight of 0.675. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Use only when tumor involves two or more distinct anatomical sites of peripheral/autonomic nerves. Because C47.8 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for C47.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use only when tumor involves two or more distinct anatomical sites of peripheral/autonomic nerves
- •Document all involved sites in the medical record to justify use of overlapping sites code
Clinical Significance
Malignant neoplasm of overlapping sites of peripheral nerves and autonomic nervous system indicates a tumor that spans multiple anatomical regions or involves both peripheral and autonomic nerve components. This reflects extensive disease with complex surgical and oncologic management needs.
Documentation Requirements
- ✓Pathology confirming malignant nerve tumor involving multiple sites or nerve systems
- ✓Documentation of all anatomical regions involved
- ✓Imaging demonstrating the overlapping nature of the tumor
- ✓Explanation of why a single site-specific code is insufficient
- ✓Treatment plan addressing the multi-site involvement
Commonly Confused Codes
- •C47.0-C47.5 (Site-specific peripheral nerve malignancies) — use when a single site is involved
- •C47.9 (Peripheral nerves, unspecified) — for unknown site, not overlapping sites
- •C49.8 (Overlapping sites of connective/soft tissue) — soft tissue overlap, not nerve
- •C72._ (Malignant neoplasm of central nervous system) — central, not peripheral nervous system