What is ICD-10 code C82.80?

C82.80 is the ICD-10-CM diagnosis code for Other types of follicular lymphoma, unspecified site. A less common type of follicular lymphoma (blood cancer) with an unspecified or unknown location in the body. It belongs to the ICD-10-CM chapter for neoplasms (c00-d49). C82.80 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. C82.80 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. C82.80 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. C82.80 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 C82.80 map to under V28?

C82.80 maps to CMS-HCC V28 21 (Lymphoma and Other Cancers). The category number and label come from the CMS-HCC V28 model file for payment year 2026.

What does C82.80 pay in RAF?

C82.80 carries a community, non-dual, aged (CNA) RAF weight of 0.671 under CMS-HCC V28 for payment year 2026. The weight comes from the CMS V28 relative-factor file, not a hand-typed table.

What is the V28 vs V24 difference for C82.80?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For C82.80, V28 maps to Lymphoma and Other Cancers at RAF 0.671 while V24 mapped to Lymphoma and Other Cancers at RAF 0.675. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports C82.80?

Use this code only when the specific anatomical site of the lymphoma is not documented or cannot be determined Query the provider if possible to obtain site-specific information for more accurate coding Because C82.80 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM C82.80: Other types of follicular

C82.80 maps to CMS-HCC V28 21 (RAF 0.671). Documentation must support MEAT. MEAT criteria · RAF calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupC82.80Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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

C82.80

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

Other types of follicular lymphoma, unspecified site

A less common type of follicular lymphoma (blood cancer) with an unspecified or unknown location in the body.

Buddy Insight

Other types of follicular lymphoma at an unspecified site is used for follicular lymphoma variants that do not fit into the standard grade I-IIIb, diffuse, or cutaneous categories.

CMS-HCC V28

Mapped

HCC 21

Lymphoma and Other Cancers

RAF 0.671

CMS-HCC V24

Mapped

HCC 10

Lymphoma and Other Cancers

RAF 0.675

ACA/HHS

Mapped

HCC 10

HHS-HCC 10

Varies by metal level

ESRD/PACE

Mapped

HCC 10

Lymphoma and Other Cancers

RAF 0.111

RXHCC

Mapped

HCC 21

Hodgkin Lymphoma and Other Ca...

RAF 0.410

Code Book Path

Official

C82Follicular lymphoma

C82.8Other types of follicular lymphoma

C82.80Other types of follicular lymphoma, unspecified site

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for C82.80 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for C82.80 in this effective period.

Related Child Codes

Official

C82.81Other types of follicular lymphoma, lymph nodes of head, face, and neck

C82.82Other types of follicular lymphoma, intrathoracic lymph nodes

C82.83Other types of follicular lymphoma, intra-abdominal lymph nodes

C82.84Other types of follicular lymphoma, lymph nodes of axilla and upper limb

C82.85Other types of follicular lymphoma, lymph nodes of inguinal region and lower limb

Includes

Official

ICD-10-CM does not list Includes notes for C82.80 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for C82.80 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for C82.80 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for C82.80 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for C82.80 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Pathology report specifying the follicular lymphoma variant that qualifies as 'other type'

Immunohistochemistry and molecular studies supporting the diagnosis

Attempt to obtain site-specific information from imaging or clinical notes

Staging evaluation appropriate to the specific variant

MEAT Support

HCC Buddy guidance

Pathology report specifying the follicular lymphoma variant that qualifies as 'other type'

Immunohistochemistry and molecular studies supporting the diagnosis

Attempt to obtain site-specific information from imaging or clinical notes

Staging evaluation appropriate to the specific variant

Audit Caution

HCC Buddy guidance

Using this code when a more specific follicular lymphoma grade code is available — always code to highest specificity

Defaulting to unspecified site when imaging clearly documents the location

Not querying pathology to determine if a more specific follicular lymphoma classification is possible

Using this code for non-follicular lymphomas that happen to involve follicle center cells (e.g., diffuse large B-cell lymphoma)

Common Mistakes

HCC Buddy guidance

C82.90 — Follicular lymphoma, unspecified, unspecified site: Use C82.80 when a specific 'other' type is identified but site is unknown; use C82.90 when both type and site are unspecified

C82.50 — Diffuse follicle center lymphoma, unspecified site: Use when specifically identified as diffuse follicle center type

C82.40 — Follicular lymphoma grade IIIb, unspecified site: Use when grade IIIb is specifically 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 C82.80 an HCC code?

Yes. C82.80 (Other types of follicular lymphoma, unspecified site) maps to Lymphoma and Other Cancers under the CMS-HCC V28 risk adjustment model (and Lymphoma and Other Cancers under V24), with a community non-dual aged RAF of 0.671. It is billable for payment year 2026.

Coder answer: C82.80 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: C82.80
Description: Other types of follicular lymphoma, unspecified site
HCC (V28): HCC 21 — Lymphoma and Other Cancers
RAF: 0.671
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 21, Lymphoma and Other Cancers

0.671

V24HCC 10, Lymphoma and Other Cancers

0.675

ESRDHCC 10, Lymphoma and Other Cancers

0.111

RxHCCHCC 21, Hodgkin Lymphoma and Other Cancers

0.410

Each model's RAF is its CMS base weight for that model's standard population, so 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 segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work C82.80 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for C82.80

For C82.80 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed C82.80 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

C82.80 is the ICD-10-CM diagnosis code for other types of follicular lymphoma, unspecified site. A less common type of follicular lymphoma (blood cancer) with an unspecified or unknown location in the body. C82.80 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, C82.80 maps to Lymphoma and Other Cancers (HCC 21) with a community, non-dual, aged base RAF weight of 0.671. Under the older V24 model, C82.80 mapped to the same category but with a base RAF weight of 0.675, V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Use this code only when the specific anatomical site of the lymphoma is not documented or cannot be determined. Because C82.80 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for C82.80 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when the specific anatomical site of the lymphoma is not documented or cannot be determined
•Query the provider if possible to obtain site-specific information for more accurate coding

Clinical Significance

Other types of follicular lymphoma at an unspecified site is used for follicular lymphoma variants that do not fit into the standard grade I-IIIb, diffuse, or cutaneous categories. This includes rare variants such as pediatric-type follicular lymphoma, follicular lymphoma with areas of diffuse large B-cell lymphoma transformation, or other unusual patterns. The unspecified site should prompt a query to identify the anatomical location from imaging or pathology reports.

Documentation Requirements

✓Pathology report specifying the follicular lymphoma variant that qualifies as 'other type'
✓Immunohistochemistry and molecular studies supporting the diagnosis
✓Attempt to obtain site-specific information from imaging or clinical notes
✓Staging evaluation appropriate to the specific variant
✓Documentation of why the standard follicular lymphoma grade codes are not applicable

Commonly Confused Codes

•C82.90: Follicular lymphoma, unspecified, unspecified site: Use C82.80 when a specific 'other' type is identified but site is unknown; use C82.90 when both type and site are unspecified
•C82.50: Diffuse follicle center lymphoma, unspecified site: Use when specifically identified as diffuse follicle center type
•C82.40: Follicular lymphoma grade IIIb, unspecified site: Use when grade IIIb is specifically documented