C32.9
BillableMalignant neoplasm of larynx, unspecified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C32.9 an HCC code?
Yes. C32.9 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 C32.9
For C32.9 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 C32.9 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C32.9 is the ICD-10-CM diagnosis code for malignant neoplasm of larynx, unspecified. Cancer of the larynx (voice box) when the specific location within the larynx cannot be determined or is not documented. C32.9 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, C32.9 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, C32.9 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.
This is a default code used when the laryngeal subsite is not specified in the documentation. Because C32.9 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 C32.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a default code used when the laryngeal subsite is not specified in the documentation
- •Attempt to query the provider or review pathology reports to identify the specific laryngeal site
Clinical Significance
Unspecified laryngeal cancer is used when malignancy is confirmed in the larynx but the specific subsite (glottis, supraglottis, subglottis) cannot be determined. Since treatment and prognosis vary significantly by laryngeal subsite, this code represents a documentation gap that should prompt provider query and record review.
Documentation Requirements
- ✓Pathology or clinical confirmation of laryngeal malignancy
- ✓Evidence that laryngoscopy or imaging was reviewed for subsite detail
- ✓Provider query documentation for subsite specificity
- ✓Treatment status and clinical stage
- ✓Reason specificity cannot be determined
Commonly Confused Codes
- •C32.0 — Glottic cancer: Most common laryngeal subsite; review records carefully before defaulting to unspecified
- •C32.1 — Supraglottic cancer: Second most common subsite; usually identifiable on laryngoscopy
- •C14.1 — Malignant neoplasm of laryngopharynx: Hypopharyngeal cancers may be confused with laryngeal cancers
- •C32.8 — Overlapping sites: If multiple subsites are involved, use overlapping rather than unspecified