C30.0 ICD-10-CM Code: Malignant neoplasm of nasal cavity
C30.0 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 · free HCC coding tools
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FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
C30.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceMalignant neoplasm of nasal cavity
Cancer that develops in the nasal cavity, the space inside the nose where air passes through.
Buddy Insight
Nasal cavity cancers are uncommon and often present late due to nonspecific symptoms like nasal obstruction and epistaxis.
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
MappedHCC 22
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Malignant neoplasm of cartilage of nose
- Malignant neoplasm of nasal concha
- Malignant neoplasm of internal nose
- Malignant neoplasm of septum of nose
- Malignant neoplasm of vestibule of nose
Excludes 2
OfficialNo Excludes 2 notes are included in this display for C30.0. 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- malignant neoplasm of nasal bone (C41.0)
- malignant neoplasm of nose NOS (C76.0)
- malignant neoplasm of olfactory bulb (C72.2-)
- malignant neoplasm of posterior margin of nasal septum and choana (C11.3)
- malignant melanoma of skin of nose (C43.31)
- malignant neoplasm of turbinates (C41.0)
- other and unspecified malignant neoplasm of skin of nose (C44.301, C44.311, C44.321, C44.391)
- mesothelioma (C45.-)Inherited from C30-C39
Code First
OfficialNo Code First sequencing instructions are included in this display for C30.0. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for C30.0. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for C30.0. 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 C30.0 an HCC code?
Yes. C30.0 (Malignant neoplasm of nasal cavity) 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: C30.0 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
- C30.0
- Description
- Malignant neoplasm of nasal cavity
- 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 C30.0 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for C30.0
For C30.0, 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
C30.0 is the ICD-10-CM diagnosis code for malignant neoplasm of nasal cavity. Cancer that develops in the nasal cavity, the space inside the nose where air passes through. C30.0 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, C30.0 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.
Distinguish between nasal cavity cancer and nasopharyngeal cancer (which uses different codes). For C30.0, 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 C30.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Distinguish between nasal cavity cancer and nasopharyngeal cancer (which uses different codes)
- •Document histology type as nasal cavity cancers can be squamous cell, adenocarcinoma, or other types
Clinical Significance
Nasal cavity cancers are uncommon and often present late due to nonspecific symptoms like nasal obstruction and epistaxis. They encompass multiple histological types including squamous cell carcinoma, adenocarcinoma, and esthesioneuroblastoma. Accurate coding is essential as treatment often involves complex surgery and radiation, driving significant resource utilization.
Documentation Requirements
- ✓Pathology confirmation with histological type (squamous cell, adenocarcinoma, esthesioneuroblastoma, melanoma)
- ✓Specific anatomical location within the nasal cavity (septum, lateral wall, turbinates, floor)
- ✓Extent of disease including any invasion into adjacent structures (orbit, sinuses, skull base)
- ✓TNM staging and treatment plan
- ✓Distinction from nasopharyngeal cancer
Excludes 1, Do NOT code together
- malignant neoplasm of nasal bone (C41.0)
- malignant neoplasm of nose NOS (C76.0)
- malignant neoplasm of olfactory bulb (C72.2-)
- malignant neoplasm of posterior margin of nasal septum and choana (C11.3)
- malignant melanoma of skin of nose (C43.31)
- malignant neoplasm of turbinates (C41.0)
- other and unspecified malignant neoplasm of skin of nose (C44.301, C44.311, C44.321, C44.391)
Commonly Confused Codes
- •C11.9: Malignant neoplasm of nasopharynx: The nasopharynx is posterior to the nasal cavity; these are anatomically and clinically distinct
- •C31.0: Malignant neoplasm of maxillary sinus: Nasal cavity tumors may extend into the maxillary sinus: code the primary site
- •D14.0: Benign neoplasm of nasal cavity: Ensure malignancy is confirmed; inverted papillomas can transform to carcinoma
- •C44.301: Basal cell carcinoma of skin of nose: External nasal skin cancers use skin codes, not nasal cavity codes