C63.8
BillableMalignant neoplasm of overlapping sites of male genital organs
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C63.8 an HCC code?
Yes. C63.8 maps to Prostate, Breast, and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model (and Breast, Prostate, and Other Cancers and Tumors 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 C63.8
For C63.8to 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 C63.8 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C63.8 is the ICD-10-CM diagnosis code for malignant neoplasm of overlapping sites of male genital organs. Cancer involving multiple male genital organs at the same time, such as both the testicle and epididymis. C63.8 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of male genital organs (c60-c63).
Under the CMS-HCC V28 risk adjustment model, C63.8 maps to Prostate, Breast, and Other Cancers and Tumors (HCC 23) with a community, non-dual, aged base RAF weight of 0.186. Under the older CMS-HCC V24 model, C63.8 maps to Breast, Prostate, and Other Cancers and Tumors (HCC 12) with a community, non-dual, aged base RAF weight of 0.150. 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.
This code is used when the tumor involves two or more contiguous male genital sites. Because C63.8 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 C63.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is used when the tumor involves two or more contiguous male genital sites
- •Document which specific organs are involved to support medical necessity
Clinical Significance
This code captures malignancies involving two or more contiguous male genital organ sites when the point of origin cannot be determined. It indicates a tumor mass spanning multiple structures (e.g., testis and epididymis, or prostate and seminal vesicles as a primary of indeterminate origin). This is distinct from metastatic spread and from extension of a known primary.
Documentation Requirements
- ✓Documentation identifying which specific male genital organs are involved
- ✓Pathologic evidence of contiguous tumor involvement across multiple sites
- ✓Statement that the point of origin cannot be determined
- ✓Staging information
- ✓Treatment plan
Commonly Confused Codes
- •C63.7 — Other specified male genital organ; use for a single specified structure
- •C63.9 — Unspecified male genital organ; overlapping is more specific than unspecified
- •C60.8 — Overlapping sites of penis; use when overlapping is confined to penile subsites
- •C61/C62/C63.0x — Specific organ codes; use when a primary site can be identified