C32.8 ICD-10-CM Code: Malignant neoplasm of overlapping sites of larynx
C32.8 maps to CMS-HCC V28 21. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
C32.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceMalignant neoplasm of overlapping sites of larynx
Cancer that involves multiple different areas of the larynx (voice box) at the same time.
Buddy Insight
Overlapping sites of larynx indicates a malignancy that spans two or more laryngeal subsites (e.
CMS-HCC V28
MappedHCC 21
Coefficient HCC 21: 0.671 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 011
Code-level coefficient reference
ESRD/PACE
MappedHCC 11
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for C32.8. Check the code and parent instructions in the Code Book.
Excludes 2
OfficialNo Excludes 2 notes are included in this display for C32.8. Check the code and parent instructions in the Code Book.
Related Codes
Includes
Official- malignant neoplasm of middle earInherited from C30-C39
Excludes 1
Official- mesothelioma (C45.-)Inherited from C30-C39
Code First
OfficialNo Code First sequencing instructions are included in this display for C32.8. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify:Inherited from C32
- alcohol abuse and dependence (F10.-)Inherited from C32
- exposure to environmental tobacco smoke (Z77.22)Inherited from C32
- exposure to tobacco smoke in the perinatal period (P96.81)Inherited from C32
- history of tobacco dependence (Z87.891)Inherited from C32
- occupational exposure to environmental tobacco smoke (Z57.31)Inherited from C32
- tobacco dependence (F17.-)Inherited from C32
- tobacco use (Z72.0)Inherited from C32
Code Also
OfficialNo Code Also instructions are included in this display for C32.8. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is C32.8 an HCC code?
Yes. C32.8 (Malignant neoplasm of overlapping sites of larynx) maps to HCC 21, Lymphoma and Other Cancers under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.671. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: C32.8 is billable and maps to V28 HCC 21, Lymphoma and Other Cancers. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- C32.8
- Description
- Malignant neoplasm of overlapping sites of larynx
- HCC (V28)
- HCC 21 — Lymphoma and Other Cancers
- RAF reference coefficient
- 0.671
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work C32.8 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for C32.8
For C32.8, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- 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
Coder workflow notes
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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 Lymphoma and Other Cancers (HCC 21) with a source-labeled community, non-dual, aged reference coefficient of 0.671. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
Use this code only when the tumor clearly spans two or more distinct laryngeal subsites. For C32.8, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. 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, source-labeled coefficient references, 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
Commonly Confused Codes
- •C32.0: Glottic cancer: If the primary site is clearly glottic with only minor extension, code as glottic
- •C32.1: Supraglottic cancer: If the primary site is clearly supraglottic with minimal inferior extension, code as supraglottic
- •C32.9: Larynx, unspecified: Do not use unspecified when overlapping sites are documented
- •C10.1: Anterior epiglottis (oropharynx): Ensure oropharyngeal extension is coded separately if present