C32.8
BillableMalignant neoplasm of overlapping sites of larynx
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C32.8 an HCC code?
Yes. C32.8 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model (and Colorectal, Bladder, 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 C32.8
For C32.8 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 C32.8 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C32.8 is the ICD-10-CM diagnosis code for malignant neoplasm of overlapping sites of larynx. Cancer that involves multiple different areas of the larynx (voice box) at the same time. C32.8 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of respiratory and intrathoracic organs (c30-c39).
Under the CMS-HCC V28 risk adjustment model, C32.8 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, C32.8 maps to Colorectal, Bladder, and Other Cancers (HCC 11) with a community, non-dual, aged base RAF weight of 0.306. 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 this code only when the tumor clearly spans two or more distinct laryngeal subsites. Because C32.8 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 C32.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the tumor clearly spans two or more distinct laryngeal subsites
- •If a single subsite is involved, use the specific site code instead
Clinical Significance
Overlapping sites of larynx indicates a malignancy that spans two or more laryngeal subsites (e.g., glottic-supraglottic or transglottic tumors). These are often locally advanced cancers with worse prognosis than single-subsite tumors. Transglottic cancers are particularly significant because they frequently require total laryngectomy.
Documentation Requirements
- ✓Laryngoscopy documenting tumor involvement of multiple laryngeal subsites
- ✓Imaging confirming extent of disease across subsites
- ✓Pathology with histological type
- ✓TNM staging reflecting the multi-subsite involvement
- ✓Treatment plan including voice preservation assessment