What is ICD-10 code C82.17?

C82.17 is the ICD-10-CM diagnosis code for Follicular lymphoma grade II, spleen. It belongs to the ICD-10-CM chapter for neoplasms (c00-d49). C82.17 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. C82.17 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. C82.17 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. C82.17 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.

What is the V28 vs V24 difference for C82.17?

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 C82.17, V28 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors at RAF 0.545 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 should coders know when reporting C82.17?

Ensure the grade (II in this case) is documented in the medical record, as different grades have different treatment approaches and prognoses Verify that the spleen is specifically identified as the primary site; if the lymphoma involves multiple sites including the spleen, additional codes may be needed to capture all involved sites Because C82.17 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.

C82.17 ICD-10 Code: Follicular lymphoma grade II

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 lookupC82.17Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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

C82.17

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

Follicular lymphoma grade II, spleen

This is a type of cancer of the lymph system (lymphoma) that starts in the spleen and is classified as grade II, meaning it grows at a moderate speed. Follicular lymphoma is one of the most common types of non-Hodgkin lymphoma.

Buddy Insight

Follicular lymphoma grade II involving the spleen indicates splenic infiltration with intermediate-grade disease.

CMS-HCC V28

Mapped

HCC 21

Breast, Prostate, Colorectal ...

RAF 0.545

CMS-HCC V24

Mapped

HCC 10

Lymphoma and Other Cancers

RAF 0.675

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 10

Lymphoma and Other Cancers

RAF 0.0

RXHCC

Mapped

HCC 21

Hodgkin Lymphoma and Other Ca...

RAF 0.0

Code Trumping

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Code Book Path

Official

C82Follicular lymphoma

C82.1Follicular lymphoma grade II

C82.17Follicular lymphoma grade II, spleen

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for C82.17 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for C82.17 in this effective period.

Related Child Codes

Official

C82.10Follicular lymphoma grade II, unspecified site

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

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

Includes

Official

ICD-10-CM does not list Includes notes for C82.17 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for C82.17 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for C82.17 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for C82.17 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for C82.17 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Pathology confirming grade II follicular lymphoma

Imaging documenting splenic involvement (size, focal lesions, diffuse pattern)

Complete blood count to assess for hypersplenism-related cytopenias

Ann Arbor stage (at least stage III with splenic involvement)

MEAT Support

HCC Buddy guidance

Pathology confirming grade II follicular lymphoma

Imaging documenting splenic involvement (size, focal lesions, diffuse pattern)

Complete blood count to assess for hypersplenism-related cytopenias

Ann Arbor stage (at least stage III with splenic involvement)

Audit Caution

HCC Buddy guidance

Coding isolated splenomegaly as splenic lymphoma without imaging or pathologic confirmation

Using extranodal code instead of the spleen-specific 5th character

Not distinguishing splenic hilar lymphadenopathy (intra-abdominal nodal) from splenic parenchymal disease

Failing to assess for secondary causes of splenomegaly (portal hypertension, infection) before attributing to lymphoma

Common Mistakes

HCC Buddy guidance

C82.07 — Grade I, spleen; verify pathology grade

C82.13 — Intra-abdominal nodes; splenic hilar nodes are nodal, splenic parenchyma is C82.17

C82.19 — Extranodal sites; spleen has its own code and is not grouped under extranodal

C82.18 — Multiple sites; if spleen plus other nodal regions are involved

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is C82.17 an HCC code?

Yes. C82.17 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model (and Lymphoma and Other Cancers under V24).

HCC Category Mapping

V28HCC 21, Breast, Prostate, Colorectal and Other Cancers and Tumors

0.545

V24HCC 10, Lymphoma and Other Cancers

0.675

ESRDHCC 10, Lymphoma and Other Cancers

0.000

RxHCCHCC 21, Hodgkin Lymphoma and Other Cancers

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. 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.

MEAT Criteria for C82.17

For C82.17to 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 C82.17 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

C82.17 is the ICD-10-CM diagnosis code for follicular lymphoma grade ii, spleen. This is a type of cancer of the lymph system (lymphoma) that starts in the spleen and is classified as grade II, meaning it grows at a moderate speed. Follicular lymphoma is one of the most common types of non-Hodgkin lymphoma. C82.17 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, C82.17 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors (HCC 21) with a community, non-dual, aged base RAF weight of 0.545. Under the older CMS-HCC V24 model, C82.17 maps to Lymphoma and Other Cancers (HCC 10) with a community, non-dual, aged base RAF weight of 0.675. 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.

Ensure the grade (II in this case) is documented in the medical record, as different grades have different treatment approaches and prognoses. Because C82.17 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 C82.17 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Ensure the grade (II in this case) is documented in the medical record, as different grades have different treatment approaches and prognoses
•Verify that the spleen is specifically identified as the primary site; if the lymphoma involves multiple sites including the spleen, additional codes may be needed to capture all involved sites

Clinical Significance

Follicular lymphoma grade II involving the spleen indicates splenic infiltration with intermediate-grade disease. Splenic involvement automatically classifies as at least stage III disease. Grade II splenic involvement may present as splenomegaly with or without cytopenias and has implications for treatment decisions including consideration of splenectomy in symptomatic patients.

Documentation Requirements

✓Pathology confirming grade II follicular lymphoma
✓Imaging documenting splenic involvement (size, focal lesions, diffuse pattern)
✓Complete blood count to assess for hypersplenism-related cytopenias
✓Ann Arbor stage (at least stage III with splenic involvement)
✓Treatment plan including whether splenectomy is being considered

Commonly Confused Codes

•C82.07 — Grade I, spleen; verify pathology grade
•C82.13 — Intra-abdominal nodes; splenic hilar nodes are nodal, splenic parenchyma is C82.17
•C82.19 — Extranodal sites; spleen has its own code and is not grouped under extranodal
•C82.18 — Multiple sites; if spleen plus other nodal regions are involved