What is ICD-10 code C82.56?

C82.56 is the ICD-10-CM diagnosis code for Diffuse follicle center lymphoma, intrapelvic lymph nodes. This is a type of cancer that starts in the lymph nodes located in the pelvis (lower abdomen). The cancer cells grow slowly and spread throughout the lymph tissue in this area. C82.56 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. C82.56 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. C82.56 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. C82.56 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does C82.56 map to under V28?

C82.56 maps to CMS-HCC V28 HCC 21 (Lymphoma and Other Cancers). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

2026 ICD-10-CM C82.56: Diffuse follicle center

C82.56 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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Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupC82.56

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)

C82.56

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

Diffuse follicle center lymphoma, intrapelvic lymph nodes

This is a type of cancer that starts in the lymph nodes located in the pelvis (lower abdomen). The cancer cells grow slowly and spread throughout the lymph tissue in this area.

Buddy Insight

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 21

Lymphoma and Other Cancers

Code-level coefficient reference

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 C82.5Diffuse follicle center lymphoma C82.56Diffuse follicle center lymphoma, intrapelvic lymph nodes

Inclusion Terms

Official

No inclusion terms are included in this display for C82.56. 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

C82.50Diffuse follicle center lymphoma, unspecified site C82.51Diffuse follicle center lymphoma, lymph nodes of head, face, and neck C82.52Diffuse follicle center lymphoma, intrathoracic lymph nodes C82.53Diffuse follicle center lymphoma, intra-abdominal lymph nodes C82.54Diffuse follicle center lymphoma, lymph nodes of axilla and upper 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 C82.56. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for C82.56. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for C82.56. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Pathology confirming diffuse follicle center lymphoma

Cross-sectional imaging (CT or MRI) identifying specific intrapelvic lymph node groups

Documentation distinguishing intrapelvic from inguinal or intra-abdominal nodes

Assessment for ureteral obstruction, venous compression, or nerve involvement

MEAT Support

HCC Buddy guidance

Pathology confirming diffuse follicle center lymphoma

Cross-sectional imaging (CT or MRI) identifying specific intrapelvic lymph node groups

Documentation distinguishing intrapelvic from inguinal or intra-abdominal nodes

Assessment for ureteral obstruction, venous compression, or nerve involvement

Audit Caution

HCC Buddy guidance

Confusing intrapelvic lymph nodes with inguinal lymph nodes — these have different anatomic locations and code assignments

Not distinguishing pelvic lymph node disease from extranodal pelvic organ involvement (bladder, uterus, rectum)

Using intra-abdominal code when imaging shows disease limited to the pelvis below the pelvic brim

Failing to code obstructive uropathy or other complications of bulky pelvic lymphadenopathy

Common Mistakes

HCC Buddy guidance

C82.55 — Diffuse follicle center lymphoma, lymph nodes of inguinal region and lower limb: Intrapelvic nodes are deep within the pelvis (iliac chains); inguinal nodes are superficial in the groin

C82.53 — Diffuse follicle center lymphoma, intra-abdominal lymph nodes: Distinguish the boundary between abdominal and pelvic nodes at approximately the pelvic brim

C82.86 — Other types of follicular lymphoma, intrapelvic lymph nodes: Use C82.56 when diffuse follicle center type is specifically confirmed

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 C82.56 an HCC code?

Yes. C82.56 (Diffuse follicle center lymphoma, intrapelvic lymph nodes) 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: C82.56 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: C82.56
Description: Diffuse follicle center lymphoma, intrapelvic lymph nodes
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 C82.56 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C82.56

For C82.56, 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

C82.56 is the ICD-10-CM diagnosis code for diffuse follicle center lymphoma, intrapelvic lymph nodes. This is a type of cancer that starts in the lymph nodes located in the pelvis (lower abdomen). The cancer cells grow slowly and spread throughout the lymph tissue in this area. C82.56 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, C82.56 maps to Lymphoma and Other Cancers (HCC 21) with a source-labeled community, non-dual, aged reference coefficient of 0.671. No V24 mapping is shown for C82.56; use the applicable model and payment year when reviewing the V28 mapping. 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.

Verify the histology is confirmed as diffuse follicle center lymphoma before assigning this code; do not use if the lymphoma type is unspecified or different. For C82.56, 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 C82.56 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify the histology is confirmed as diffuse follicle center lymphoma before assigning this code; do not use if the lymphoma type is unspecified or different
•Ensure documentation specifies that the intrapelvic lymph nodes are involved; if lymphoma involves multiple sites, assign additional codes for each anatomical location affected

Clinical Significance

Diffuse follicle center lymphoma involving intrapelvic lymph nodes (iliac, obturator, presacral) may be discovered incidentally on imaging or present with pelvic symptoms including pain, ureteral obstruction, or lower extremity edema from venous compression. Pelvic lymphadenopathy requires differentiation from gynecologic or urologic malignancies. Accurate anatomic localization distinguishes intrapelvic nodes from inguinal nodes, which has staging and coding implications.

Documentation Requirements

✓Pathology confirming diffuse follicle center lymphoma
✓Cross-sectional imaging (CT or MRI) identifying specific intrapelvic lymph node groups
✓Documentation distinguishing intrapelvic from inguinal or intra-abdominal nodes
✓Assessment for ureteral obstruction, venous compression, or nerve involvement
✓Staging documentation and assessment of other sites of disease

Commonly Confused Codes

•C82.55: Diffuse follicle center lymphoma, lymph nodes of inguinal region and lower limb: Intrapelvic nodes are deep within the pelvis (iliac chains); inguinal nodes are superficial in the groin
•C82.53: Diffuse follicle center lymphoma, intra-abdominal lymph nodes: Distinguish the boundary between abdominal and pelvic nodes at approximately the pelvic brim
•C82.86: Other types of follicular lymphoma, intrapelvic lymph nodes: Use C82.56 when diffuse follicle center type is specifically confirmed