C82.11 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

ICD-10-CM Code View

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Code lookupC82.11

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)

C82.11

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

Follicular lymphoma grade II, lymph nodes of head, face, and neck

This is a type of cancer that starts in the lymph nodes located in the head, neck, and face area, where the cancer cells are growing at a moderate rate (grade II). Follicular lymphoma is a slow-growing blood cancer that affects the immune system's lymph nodes.

Buddy Insight

Follicular lymphoma grade II involving head, face, and neck lymph nodes represents intermediate-grade disease in a readily palpable location.

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 21

Lymphomas and Other Hematolog...

Code-level coefficient reference

Code Book Path

Official

C82Follicular lymphoma C82.1Follicular lymphoma grade II C82.11Follicular lymphoma grade II, lymph nodes of head, face, and neck

Inclusion Terms

Official

No inclusion terms are included in this display for C82.11. Check the code and parent instructions in the Code Book.

Excludes 2

Official

Kaposi's sarcoma of lymph nodes (C46.3)Inherited from C81-C96
secondary and unspecified neoplasm of lymph nodes (C77.-)Inherited from C81-C96
secondary neoplasm of bone marrow (C79.52)Inherited from C81-C96
secondary neoplasm of spleen (C78.89)Inherited from C81-C96

Related Codes

Official

C82.10Follicular lymphoma grade II, unspecified site C82.12Follicular lymphoma grade II, intrathoracic lymph nodes C82.13Follicular lymphoma grade II, intra-abdominal lymph nodes C82.14Follicular lymphoma grade II, lymph nodes of axilla and upper limb C82.15Follicular lymphoma grade II, lymph nodes of inguinal region and lower limb

Includes

Official

follicular lymphoma with or without diffuse areasInherited from C82

Excludes 1

Official

mature T/NK-cell lymphomas (C84.-)Inherited from C82
personal history of non-Hodgkin lymphoma (Z85.72)Inherited from C82

Code First

Official

No Code First sequencing instructions are included in this display for C82.11. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for C82.11. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for C82.11. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Pathology report specifying grade II follicular lymphoma (6-15 centroblasts per HPF)

Documentation of specific head, face, or neck lymph node involvement (cervical, submandibular, supraclavicular, etc.)

Ann Arbor staging

Assessment for transformation risk

MEAT Support

HCC Buddy guidance

Pathology report specifying grade II follicular lymphoma (6-15 centroblasts per HPF)

Documentation of specific head, face, or neck lymph node involvement (cervical, submandibular, supraclavicular, etc.)

Ann Arbor staging

Assessment for transformation risk

Audit Caution

HCC Buddy guidance

Not updating the code when follicular lymphoma transforms to diffuse large B-cell lymphoma — requires code change to C83.3x

Coding cervical node reactive lymphadenopathy as lymphoma without pathologic confirmation

Failing to differentiate supraclavicular nodes (head/neck region) from axillary nodes (upper limb region)

Using unspecified grade when pathology clearly states the centroblast count or WHO grade

Common Mistakes

HCC Buddy guidance

C82.01 — Grade I of same site; verify centroblast count — grade boundary matters for prognosis

C82.21 — Grade III unspecified, head/face/neck; grade III has >15 centroblasts and is treated more aggressively

C83.31 — Diffuse large B-cell lymphoma, head/face/neck; if transformation has occurred, use the diffuse large B-cell code instead

C82.1A — Grade II in remission; use only when remission is explicitly documented

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 C82.11 an HCC code?

Yes. C82.11 (Follicular lymphoma grade II, lymph nodes 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: C82.11 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: C82.11
Description: Follicular lymphoma grade II, lymph nodes 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 21, Lymphomas and Other Hematologic 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 C82.11 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C82.11

For C82.11, 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

C82.11 is the ICD-10-CM diagnosis code for follicular lymphoma grade ii, lymph nodes of head, face, and neck. This is a type of cancer that starts in the lymph nodes located in the head, neck, and face area, where the cancer cells are growing at a moderate rate (grade II). Follicular lymphoma is a slow-growing blood cancer that affects the immune system's lymph nodes. C82.11 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of lymphoid, hematopoietic and related tissue (c81-c96).

Under the CMS-HCC V28 risk adjustment model, C82.11 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.

The fifth character '1' indicates lymph nodes of head, face, and neck are involved; verify documentation specifies this anatomical location to ensure accurate coding. For C82.11, 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 C82.11 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•The fifth character '1' indicates lymph nodes of head, face, and neck are involved; verify documentation specifies this anatomical location to ensure accurate coding
•Grade II indicates intermediate differentiation; confirm the pathology report documents the specific grade, as different grades (I, II, III) have different code assignments and prognostic implications

Clinical Significance

Follicular lymphoma grade II involving head, face, and neck lymph nodes represents intermediate-grade disease in a readily palpable location. Grade II follicular lymphoma has a marginally more aggressive course than grade I and may transform to diffuse large B-cell lymphoma over time. Cervical lymphadenopathy is often the presenting finding that leads to biopsy and diagnosis.

Documentation Requirements

✓Pathology report specifying grade II follicular lymphoma (6-15 centroblasts per HPF)
✓Documentation of specific head, face, or neck lymph node involvement (cervical, submandibular, supraclavicular, etc.)
✓Ann Arbor staging
✓Assessment for transformation risk
✓Current treatment approach (observation, rituximab, chemoimmunotherapy)

Commonly Confused Codes

•C82.01: Grade I of same site; verify centroblast count: grade boundary matters for prognosis
•C82.21: Grade III unspecified, head/face/neck; grade III has >15 centroblasts and is treated more aggressively
•C83.31: Diffuse large B-cell lymphoma, head/face/neck; if transformation has occurred, use the diffuse large B-cell code instead
•C82.1A: Grade II in remission; use only when remission is explicitly documented