C83.85 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

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 lookupC83.85

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)

C83.85

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

Other non-follicular lymphoma, lymph nodes of inguinal region and lower limb

A type of non-follicular lymphoma affecting the lymph nodes in the groin area and lower legs.

Buddy Insight

Other non-follicular lymphoma of inguinal region and lower limb lymph nodes affects the groin and lower extremity lymphatic drainage.

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

C83Non-follicular lymphoma C83.8Other non-follicular lymphoma C83.85Other non-follicular lymphoma, lymph nodes of inguinal region and lower limb

Inclusion Terms

Official

Intravascular large B-cell lymphomaInherited from C83.8
Lymphoid granulomatosisInherited from C83.8
Primary effusion B-cell lymphomaInherited from C83.8

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

C83.80Other non-follicular lymphoma, unspecified site C83.81Other non-follicular lymphoma, lymph nodes of head, face, and neck C83.82Other non-follicular lymphoma, intrathoracic lymph nodes C83.83Other non-follicular lymphoma, intra-abdominal lymph nodes C83.84Other non-follicular lymphoma, lymph nodes of axilla and upper limb

Includes

Official

No Includes notes are included in this display for C83.85. Check the code and parent instructions in the Code Book.

Excludes 1

Official

personal history of non-Hodgkin lymphoma (Z85.72)Inherited from C83, C83.8
mediastinal (thymic) large B-cell lymphoma (C85.2-)Inherited from C83, C83.8
T-cell rich B-cell lymphoma (C83.3-)Inherited from C83, C83.8

Code First

Official

No Code First sequencing instructions are included in this display for C83.85. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for C83.85. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for C83.85. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Pathology report confirming non-follicular lymphoma from inguinal or lower limb lymph node biopsy

Physical exam or imaging documenting inguinal or lower limb lymph node involvement

Laterality if specified (right vs. left)

Assessment for concurrent pelvic or abdominal lymph node involvement

MEAT Support

HCC Buddy guidance

Pathology report confirming non-follicular lymphoma from inguinal or lower limb lymph node biopsy

Physical exam or imaging documenting inguinal or lower limb lymph node involvement

Laterality if specified (right vs. left)

Assessment for concurrent pelvic or abdominal lymph node involvement

Audit Caution

HCC Buddy guidance

Confusing inguinal lymphoma with metastatic disease from genitourinary or lower extremity primary cancers

Defaulting to unspecified site when inguinal lymphadenopathy is documented on physical exam

Misassigning intrapelvic (C83.86) when the nodes involved are actually inguinal

Not querying the provider when 'groin lymphadenopathy' is mentioned without lymphoma subtype specification

Common Mistakes

HCC Buddy guidance

C83.95 — Non-follicular (diffuse) lymphoma, unspecified, inguinal/lower limb: C83.85 is for a known 'other' subtype; C83.95 is for unspecified subtype

C83.86 — Other non-follicular lymphoma, intrapelvic: Pelvic lymph nodes are distinct from inguinal nodes; ensure correct anatomic assignment

C77.4 — Secondary malignant neoplasm of inguinal lymph nodes: Use for metastatic disease, not primary lymphoma

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 C83.85 an HCC code?

Yes. C83.85 (Other non-follicular lymphoma, lymph nodes of inguinal region and lower limb) 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: C83.85 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: C83.85
Description: Other non-follicular lymphoma, lymph nodes of inguinal region and lower limb
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 C83.85 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C83.85

For C83.85, 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

C83.85 is the ICD-10-CM diagnosis code for other non-follicular lymphoma, lymph nodes of inguinal region and lower limb. A type of non-follicular lymphoma affecting the lymph nodes in the groin area and lower legs. C83.85 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, C83.85 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 includes inguinal lymph nodes and lymph nodes of the lower extremities. For C83.85, 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 C83.85 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This includes inguinal lymph nodes and lymph nodes of the lower extremities
•Specify if involvement is in the groin, thigh, or lower leg area when possible

Clinical Significance

Other non-follicular lymphoma of inguinal region and lower limb lymph nodes affects the groin and lower extremity lymphatic drainage. Inguinal lymphoma is less common than axillary or cervical presentations and must be differentiated from reactive inguinal lymphadenopathy or metastatic disease from pelvic or lower extremity malignancies. Accurate coding supports proper staging and risk assessment.

Documentation Requirements

✓Pathology report confirming non-follicular lymphoma from inguinal or lower limb lymph node biopsy
✓Physical exam or imaging documenting inguinal or lower limb lymph node involvement
✓Laterality if specified (right vs. left)
✓Assessment for concurrent pelvic or abdominal lymph node involvement
✓Treatment status and staging documentation

Commonly Confused Codes

•C83.95: Non-follicular (diffuse) lymphoma, unspecified, inguinal/lower limb: C83.85 is for a known 'other' subtype; C83.95 is for unspecified subtype
•C83.86: Other non-follicular lymphoma, intrapelvic: Pelvic lymph nodes are distinct from inguinal nodes; ensure correct anatomic assignment
•C77.4: Secondary malignant neoplasm of inguinal lymph nodes: Use for metastatic disease, not primary lymphoma