C84.47 maps to CMS-HCC V28 19. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupC84.47

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)

C84.47

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

Peripheral T-cell lymphoma, not elsewhere classified, spleen

A type of cancer affecting T-cells (immune cells) that is not classified elsewhere, specifically involving the spleen.

Buddy Insight

Peripheral T-cell lymphoma not elsewhere classified with splenic involvement indicates systemic disease affecting this major lymphoid organ.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 19

Myelodysplastic Syndromes, Mu...

Coefficient HCC 19: 1.798 (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

C84Mature T/NK-cell lymphomas C84.4Peripheral T-cell lymphoma, not elsewhere classified C84.47Peripheral T-cell lymphoma, not elsewhere classified, spleen

Inclusion Terms

Official

Lennert's lymphomaInherited from C84.4
Lymphoepithelioid lymphomaInherited from C84.4
Mature T-cell lymphoma, not elsewhere classifiedInherited from C84.4

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

C84.40Peripheral T-cell lymphoma, not elsewhere classified, unspecified site C84.41Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck C84.42Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes C84.43Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes C84.44Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limb

Includes

Official

No Includes notes are included in this display for C84.47. Check the code and parent instructions in the Code Book.

Excludes 1

Official

personal history of non-Hodgkin lymphoma (Z85.72)Inherited from C84

Code First

Official

No Code First sequencing instructions are included in this display for C84.47. Check the code and parent instructions in the Code Book.

Use Additional

Official

No Use Additional Code instructions are included in this display for C84.47. Check the code and parent instructions in the Code Book.

Code Also

Official

No Code Also instructions are included in this display for C84.47. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Pathology confirming PTCL-NOS with immunophenotyping excluding hepatosplenic T-cell lymphoma

Imaging documenting splenic involvement (CT, PET/CT, or ultrasound showing splenomegaly or focal lesions)

Splenectomy pathology if applicable

Documentation distinguishing between primary splenic involvement and generalized disease

MEAT Support

HCC Buddy guidance

Pathology confirming PTCL-NOS with immunophenotyping excluding hepatosplenic T-cell lymphoma

Imaging documenting splenic involvement (CT, PET/CT, or ultrasound showing splenomegaly or focal lesions)

Splenectomy pathology if applicable

Documentation distinguishing between primary splenic involvement and generalized disease

Audit Caution

HCC Buddy guidance

Failing to distinguish hepatosplenic T-cell lymphoma (C86.1) from PTCL-NOS involving the spleen — very different prognoses

Coding spleen involvement under intra-abdominal nodes (C84.43) or extranodal sites (C84.49) when C84.47 is the specific code

Not documenting whether splenic involvement is isolated or part of widespread disease

Assigning this code based on splenomegaly alone without pathologic confirmation of lymphoma involvement

Common Mistakes

HCC Buddy guidance

C86.1 — Hepatosplenic T-cell lymphoma: A distinct entity with gamma-delta T-cell phenotype, sinusoidal infiltration pattern, and much worse prognosis; must be excluded before coding PTCL-NOS of spleen

C84.43 — PTCL-NOS, intra-abdominal lymph nodes: Splenic involvement is separate from abdominal lymph node disease; the spleen is an organ, not a lymph node

C84.48 — PTCL-NOS, multiple sites: If both spleen and lymph nodes are involved, coding guidance may direct to multiple sites

C84.49 — PTCL-NOS, extranodal/solid organ: The spleen has its own designated code (7th character 7), so use C84.47, not C84.49

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 C84.47 an HCC code?

Yes. C84.47 (Peripheral T-cell lymphoma, not elsewhere classified, spleen) maps to HCC 19, Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 1.798. 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: C84.47 is billable and maps to V28 HCC 19, Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: C84.47
Description: Peripheral T-cell lymphoma, not elsewhere classified, spleen
HCC (V28): HCC 19 — Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers
RAF reference coefficient: 1.798
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 19, Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers

1.798

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 C84.47 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C84.47

For C84.47, 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

C84.47 is the ICD-10-CM diagnosis code for peripheral t-cell lymphoma, not elsewhere classified, spleen. A type of cancer affecting T-cells (immune cells) that is not classified elsewhere, specifically involving the spleen. C84.47 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, C84.47 maps to Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers (HCC 19) with a source-labeled community, non-dual, aged reference coefficient of 1.798. 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 documentation specifies the spleen as the primary site of involvement. For C84.47, 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 C84.47 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify documentation specifies the spleen as the primary site of involvement
•Confirm this is peripheral T-cell lymphoma NOS and not a more specific subtype

Clinical Significance

Peripheral T-cell lymphoma not elsewhere classified with splenic involvement indicates systemic disease affecting this major lymphoid organ. Splenic involvement often presents with splenomegaly, cytopenias, and constitutional symptoms. Differentiating PTCL-NOS from hepatosplenic T-cell lymphoma (a distinct aggressive subtype) is critical for treatment and prognosis.

Documentation Requirements

✓Pathology confirming PTCL-NOS with immunophenotyping excluding hepatosplenic T-cell lymphoma
✓Imaging documenting splenic involvement (CT, PET/CT, or ultrasound showing splenomegaly or focal lesions)
✓Splenectomy pathology if applicable
✓Documentation distinguishing between primary splenic involvement and generalized disease
✓Active disease status documented

Commonly Confused Codes

•C86.1: Hepatosplenic T-cell lymphoma: A distinct entity with gamma-delta T-cell phenotype, sinusoidal infiltration pattern, and much worse prognosis; must be excluded before coding PTCL-NOS of spleen
•C84.43: PTCL-NOS, intra-abdominal lymph nodes: Splenic involvement is separate from abdominal lymph node disease; the spleen is an organ, not a lymph node
•C84.48: PTCL-NOS, multiple sites: If both spleen and lymph nodes are involved, coding guidance may direct to multiple sites
•C84.49: PTCL-NOS, extranodal/solid organ: The spleen has its own designated code (7th character 7), so use C84.47, not C84.49