C49.0 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 · HCC Buddy coding tools

ICD-10-CM Code View

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Code lookupC49.0

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of mesothelial and soft tissue (C45-C49)

C49.0

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

Malignant neoplasm of connective and soft tissue of head, face and neck

A malignant (cancerous) tumor that develops in the soft tissues and connective tissues of the head, face, or neck region, such as muscles, fat, or fibrous tissue.

Buddy Insight

Malignant neoplasm of connective and soft tissue of head, face, and neck encompasses a wide range of sarcomas (rhabdomyosarcoma, fibrosarcoma, angiosarcoma, etc.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 21

Lymphoma and Other Cancers

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

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 010

HHS-HCC 010 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 10

Lymphoma and Other Cancers

Code-level coefficient reference

RXHCC

Mapped

HCC 22

Prostate, Breast, Bladder, an...

Code-level coefficient reference

Code Book Path

Official

C49Malignant neoplasm of other connective and soft tissue C49.0Malignant neoplasm of connective and soft tissue of head, face and neck

Inclusion Terms

Official

Malignant neoplasm of connective tissue of ear
Malignant neoplasm of connective tissue of eyelid

Excludes 2

Official

Kaposi's sarcoma of soft tissue (C46.1)Inherited from C49
malignant neoplasm of heart (C38.0)Inherited from C49
malignant neoplasm of peripheral nerves and autonomic nervous system (C47.-)Inherited from C49
malignant neoplasm of peritoneum (C48.2)Inherited from C49
malignant neoplasm of retroperitoneum (C48.0)Inherited from C49
malignant neoplasm of uterine ligament (C57.3)Inherited from C49
mesothelioma (C45.-)Inherited from C49

Related Codes

Official

C49.1Malignant neoplasm of connective and soft tissue of upper limb, including shoulder C49.2Malignant neoplasm of connective and soft tissue of lower limb, including hip C49.3Malignant neoplasm of connective and soft tissue of thorax C49.4Malignant neoplasm of connective and soft tissue of abdomen C49.5Malignant neoplasm of connective and soft tissue of pelvis

Includes

Official

malignant neoplasm of blood vesselInherited from C49
malignant neoplasm of bursaInherited from C49
malignant neoplasm of cartilageInherited from C49
malignant neoplasm of fasciaInherited from C49
malignant neoplasm of fatInherited from C49
malignant neoplasm of ligament, except uterineInherited from C49
malignant neoplasm of lymphatic vesselInherited from C49
malignant neoplasm of muscleInherited from C49
malignant neoplasm of synoviaInherited from C49
malignant neoplasm of tendon (sheath)Inherited from C49

Excludes 1

Official

connective tissue of orbit (C69.6-)
malignant neoplasm of cartilage (of):Inherited from C49
articular (C40-C41)Inherited from C49
larynx (C32.3)Inherited from C49
nose (C30.0)Inherited from C49
malignant neoplasm of connective tissue of breast (C50.-)Inherited from C49

Code First

Official

No Code First sequencing instructions are included in this display for C49.0. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for C49.0. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for C49.0. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Pathology confirming malignant soft tissue neoplasm with specific histological subtype

Exact anatomical location within head, face, or neck

Tumor size, depth (superficial versus deep), and grade

Relationship to critical structures (major vessels, nerves, airway)

MEAT Support

HCC Buddy guidance

Pathology confirming malignant soft tissue neoplasm with specific histological subtype

Exact anatomical location within head, face, or neck

Tumor size, depth (superficial versus deep), and grade

Relationship to critical structures (major vessels, nerves, airway)

Audit Caution

HCC Buddy guidance

Confusing soft tissue sarcomas with peripheral nerve tumors — verify tissue of origin from pathology

Coding skin melanoma or skin carcinoma under the soft tissue code when it is actually cutaneous

Using the ill-defined site code C76.0 when the soft tissue origin is confirmed on pathology

Not specifying the histological subtype, which significantly affects treatment and prognosis

Common Mistakes

HCC Buddy guidance

C47.0 (Malignant neoplasm of peripheral nerves of head/face/neck) — nerve sheath origin, not general soft tissue

C41.0 (Malignant neoplasm of bones of skull and face) — bone tumor, not soft tissue

C43._ (Melanoma of skin) — skin melanoma has different codes than soft tissue sarcoma

C76.0 (Malignant neoplasm of head, face, and neck) — ill-defined site code, less specific

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 C49.0 an HCC code?

Yes. C49.0 (Malignant neoplasm of connective and soft tissue of head, face and neck) 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: C49.0 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: C49.0
Description: Malignant neoplasm of connective and soft tissue of head, face and neck
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 10, Lymphoma and Other Cancers

Not separately weighted

RxHCCHCC 22, Prostate, Breast, Bladder, and Other Cancers and Tumors

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 C49.0 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C49.0

For C49.0, 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

C49.0 is the ICD-10-CM diagnosis code for malignant neoplasm of connective and soft tissue of head, face and neck. A malignant (cancerous) tumor that develops in the soft tissues and connective tissues of the head, face, or neck region, such as muscles, fat, or fibrous tissue. C49.0 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of mesothelial and soft tissue (c45-c49).

Under the CMS-HCC V28 risk adjustment model, C49.0 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.

This code includes soft tissue sarcomas of the head and neck; ensure the tumor is in soft tissue, not bone or skin. For C49.0, 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 C49.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This code includes soft tissue sarcomas of the head and neck; ensure the tumor is in soft tissue, not bone or skin
•Specify laterality (left/right) if applicable, though this code does not require it

Clinical Significance

Malignant neoplasm of connective and soft tissue of head, face, and neck encompasses a wide range of sarcomas (rhabdomyosarcoma, fibrosarcoma, angiosarcoma, etc.) in a challenging anatomical region. These tumors often require complex reconstruction after resection and carry significant morbidity due to proximity to critical structures.

Documentation Requirements

✓Pathology confirming malignant soft tissue neoplasm with specific histological subtype
✓Exact anatomical location within head, face, or neck
✓Tumor size, depth (superficial versus deep), and grade
✓Relationship to critical structures (major vessels, nerves, airway)
✓Distinction from nerve sheath tumors (C47.0) and bone tumors (C41.0)

Excludes 1, Do NOT code together

connective tissue of orbit (C69.6-)

Commonly Confused Codes

•C47.0 (Malignant neoplasm of peripheral nerves of head/face/neck): nerve sheath origin, not general soft tissue
•C41.0 (Malignant neoplasm of bones of skull and face): bone tumor, not soft tissue
•C43._ (Melanoma of skin): skin melanoma has different codes than soft tissue sarcoma
•C76.0 (Malignant neoplasm of head, face, and neck): ill-defined site code, less specific