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C32.9 ICD-10-CM Code: Malignant neoplasm of larynx, unspecified

C32.9 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 coding software

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupC32.9

FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)

C32.9

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

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.

Buddy the Bee presenting code insight

Buddy Insight

Unspecified laryngeal cancer is used when malignancy is confirmed in the larynx but the specific subsite (glottis, supraglottis, subglottis) cannot be determined.

OverviewRisk ModelsCode BookDocumentationAuditNotesEdition comparison

CMS-HCC V28

HCC 21

Coefficient HCC 21: 0.671 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

HCC 011

Code-level coefficient reference

ESRD/PACE

HCC 11

Code-level coefficient reference

RXHCC

N/A

—

Not mapped

Code Book Path

Official
C32Malignant neoplasm of larynxC32.9Malignant neoplasm of larynx, unspecified

Inclusion Terms

Official

No inclusion terms are included in this display for C32.9. Check the code and parent instructions in the Code Book.

Excludes 2

Official

No Excludes 2 notes are included in this display for C32.9. Check the code and parent instructions in the Code Book.

Related Codes

Official
C32.0Malignant neoplasm of glottisC32.1Malignant neoplasm of supraglottisC32.2Malignant neoplasm of subglottisC32.3Malignant neoplasm of laryngeal cartilageC32.8Malignant neoplasm of overlapping sites of larynx

Includes

Official
  • malignant neoplasm of middle earInherited from C30-C39

Excludes 1

Official
  • mesothelioma (C45.-)Inherited from C30-C39

Code First

Official

No Code First sequencing instructions are included in this display for C32.9. 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

Official

No Code Also instructions are included in this display for C32.9. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance
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

MEAT Support

HCC Buddy guidance
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

Audit Caution

HCC Buddy guidance
Using unspecified as a convenience when laryngoscopy reports specify the subsite
Not reviewing ENT or oncology notes that typically document the laryngeal subsite
Confusing laryngeal cancer with hypopharyngeal cancer which has different codes and staging
Failing to query the provider — laryngeal subsite is almost always determinable

Common Mistakes

HCC Buddy guidance
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

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 C32.9 an HCC code?

Yes. C32.9 (Malignant neoplasm of larynx, unspecified) 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: C32.9 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
C32.9
Description
Malignant neoplasm of larynx, unspecified
HCC (V28)
HCC 21 — Lymphoma and Other Cancers
RAF reference coefficient
0.671
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 21, Lymphoma and Other Cancers
0.671
ESRDHCC 11, Colorectal/Bladder/and Other Cancers
Not separately weighted

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 C32.9 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C32.9

For C32.9, 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

C32.9 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 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.

This is a default code used when the laryngeal subsite is not specified in the documentation. For C32.9, 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 C32.9 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

Child Codes

C32.0Malignant neoplasm of glottis
HCC 21
C32.1Malignant neoplasm of supraglottis
HCC 21
C32.2Malignant neoplasm of subglottis
HCC 21
C32.3Malignant neoplasm of laryngeal cartilage
HCC 21
C32.8Malignant neoplasm of overlapping sites of larynx
HCC 21
C32.9Malignant neoplasm of larynx, unspecified
HCC 21

Code Hierarchy

└C32Malignant neoplasm of larynx└C32.9Malignant neoplasm of larynx, unspecified
└C32.9Malignant neoplasm of larynx, unspecified

Also searched as

  • C32 9
  • C329

For C32.9, 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.

C32.9 maps to CMS-HCC V28 category 21, Lymphoma and Other Cancers. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies a payment HCC category for C32.9. Review its source-labeled HCC coefficient above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

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