C86.21 ICD-10-CM Code: Enteropathy-type (intestinal) T-cell lymphoma, in remission
C86.21 maps to CMS-HCC V28 20. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
C86.21
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceEnteropathy-type (intestinal) T-cell lymphoma, in remission
A rare lymphoma of the intestines caused by abnormal T-cells that is currently in remission.
Buddy Insight
Enteropathy-type intestinal T-cell lymphoma in remission represents a rare but meaningful clinical outcome in a disease with typically poor prognosis.
CMS-HCC V28
MappedHCC 20
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 010
Code-level coefficient reference
ESRD/PACE
MappedHCC 10
Code-level coefficient reference
RXHCC
MappedHCC 21
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Enteropathy associated T-cell lymphoma, in remission
- Enteropathy associated T-cell lymphomaInherited from C86.2
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
Includes
OfficialNo Includes notes are included in this display for C86.21. Check the code and parent instructions in the Code Book.
Excludes 1
Official- anaplastic large cell lymphoma, ALK negative (C84.7-)Inherited from C86
- anaplastic large cell lymphoma, ALK positive (C84.6-)Inherited from C86
- mature T/NK-cell lymphomas (C84.-)Inherited from C86
- other specified types of non-Hodgkin lymphoma (C85.8-)Inherited from C86
Code First
OfficialNo Code First sequencing instructions are included in this display for C86.21. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for C86.21. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for C86.21. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 C86.21 an HCC code?
Yes. C86.21 (Enteropathy-type (intestinal) T-cell lymphoma, in remission) maps to HCC 20, Lung and Other Severe Cancers under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 1.136. 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: C86.21 is billable and maps to V28 HCC 20, Lung and Other Severe Cancers. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- C86.21
- Description
- Enteropathy-type (intestinal) T-cell lymphoma, in remission
- HCC (V28)
- HCC 20 — Lung and Other Severe Cancers
- RAF reference coefficient
- 1.136
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
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 C86.21 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for C86.21
For C86.21, 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
C86.21 is the ICD-10-CM diagnosis code for enteropathy-type (intestinal) t-cell lymphoma, in remission. A rare lymphoma of the intestines caused by abnormal T-cells that is currently in remission. C86.21 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, C86.21 maps to Lung and Other Severe Cancers (HCC 20) with a source-labeled community, non-dual, aged reference coefficient of 1.136. No V24 mapping is shown for C86.21; 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.
Document the specific intestinal location if available. For C86.21, 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 C86.21 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the specific intestinal location if available
- •Confirm remission status is explicitly stated in clinical notes
Clinical Significance
Enteropathy-type intestinal T-cell lymphoma in remission represents a rare but meaningful clinical outcome in a disease with typically poor prognosis. Remission may be achieved through aggressive chemotherapy, potentially combined with surgical resection. These patients require ongoing surveillance for both lymphoma relapse and management of underlying celiac disease or other enteropathy.
Documentation Requirements
- ✓Remission must be explicitly documented by the provider with supporting evidence from imaging and endoscopic surveillance.
- ✓The underlying enteropathy (typically celiac disease) should be documented along with adherence to dietary restrictions.
- ✓Surveillance schedule and monitoring for treatment-related complications must be recorded.
Commonly Confused Codes
- •C86.20 (EATL not in remission) indicates active disease.
- •Z85.79 (personal history of malignant neoplasm of lymphoid tissue) is only for cured disease not under oncologic surveillance.
- •K90.0 (celiac disease) should be coded as an additional diagnosis when the underlying enteropathy is still present.