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ICD-10-CM 2027 diagnosis code

C86.41Blastic NK-cell lymphoma, in remission

✓ Billable / specificCC — complication/comorbidity

C86.41 is a valid, billable ICD-10-CM code for blastic nk-cell lymphoma, in remission. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C86.41

C86.41 is the ICD-10-CM diagnosis code for Blastic NK-cell lymphoma, in remission. It belongs to category C86 (other specified types of T/NK-cell lymphoma), block C81-C96 (malignant neoplasms of lymphoid, hematopoietic and related tissue) and chapter 2 (neoplasms). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within C86.4 (Blastic NK-cell lymphoma), C86.41 is specifically for Blastic NK-cell lymphoma, in remission. Related codes cover not having achieved remission (C86.40).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 820 (Lymphoma and Leukemia with Major O.R. Procedures with MCC, relative weight 6.2481), DRG 821 (Lymphoma and Leukemia with Major O.R. Procedures with CC, relative weight 2.2023), DRG 822 (Lymphoma and Leukemia with Major O.R. Procedures without CC/MCC, relative weight 1.1272), DRG 823 (Lymphoma and Non-Acute Leukemia with Other Procedures with MCC, relative weight 4.6059), DRG 824 (Lymphoma and Non-Acute Leukemia with Other Procedures with CC, relative weight 2.2515), DRG 825 (Lymphoma and Non-Acute Leukemia with Other Procedures without CC/MCC, relative weight 1.2995) and 6 more, in MDC 17 (Myeloproliferative Diseases and Disorders, Poorly Differentiated Neoplasms) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2025, effective October 1, 2024.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Blastic plasmacytoid dendritic cell neoplasm (BPDCN), in remission

Notes that apply from higher levels

Instructions written at a parent level also apply to C86.41.

› From C86 Other specified types of T/NK-cell lymphoma
Excludes1
  • anaplastic large cell lymphoma, ALK negative (C84.7-)
  • anaplastic large cell lymphoma, ALK positive (C84.6-)
  • mature T/NK-cell lymphomas (C84.-)
  • other specified types of non-Hodgkin lymphoma (C85.8-)

Broader instructions also apply from C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue and Chapter 2: Neoplasms.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2025 (effective 10/1/2024): Added
  • No changes since FY2025.

Common questions about C86.41

Is C86.41 billable?

Yes. C86.41 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can C86.41 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict C86.41 as a principal diagnosis.

Is C86.41 a CC or MCC?

C86.41 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does C86.41 group to?

C86.41 is used in the MS-DRG v44.0 logic for MS-DRG 820 (Lymphoma and Leukemia with Major O.R. Procedures with MCC), MS-DRG 821 (Lymphoma and Leukemia with Major O.R. Procedures with CC), MS-DRG 822 (Lymphoma and Leukemia with Major O.R. Procedures without CC/MCC), MS-DRG 823 (Lymphoma and Non-Acute Leukemia with Other Procedures with MCC), MS-DRG 824 (Lymphoma and Non-Acute Leukemia with Other Procedures with CC), MS-DRG 825 (Lymphoma and Non-Acute Leukemia with Other Procedures without CC/MCC) and 6 more. Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.