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ICD-10-CM 2027 diagnosis code

D89.84IgG4-related disease

✓ Billable / specific

D89.84 is a valid, billable ICD-10-CM code for igg4-related disease. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About D89.84

D89.84 is the ICD-10-CM diagnosis code for IgG4-related disease. It belongs to category D89 (other disorders involving the immune mechanism, not elsewhere classified), block D80-D89 (certain disorders involving the immune mechanism) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within D89.8 (other specified disorders involving the immune mechanism, not elsewhere classified), D89.84 is specifically for IgG4-related disease. Related codes cover graft-versus-host disease (D89.81), autoimmune lymphoproliferative syndrome [ALPS] (D89.82), Cytokine release syndrome (D89.83) and other specified disorders involving the immune mechanism, not elsewhere classified (D89.89).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 814 (Reticuloendothelial and Immunity Disorders with MCC, relative weight 2.0729), DRG 815 (Reticuloendothelial and Immunity Disorders with CC, relative weight 1.0444) and DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC, relative weight 0.7381), in MDC 16 (Diseases and Disorders of the Blood and Blood Forming Organs and Immunological Disorders), 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 FY2024, effective October 1, 2023.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Immunoglobulin G4-related disease

Notes that apply from higher levels

Instructions written at a parent level also apply to D89.84.

› From D89 Other disorders involving the immune mechanism, not elsewhere classified
Excludes1
  • hyperglobulinemia NOS (R77.1)
  • monoclonal gammopathy (of undetermined significance) (D47.2)
Excludes2
  • transplant failure and rejection (T86.-)

Broader instructions also apply from D80-D89 Certain disorders involving the immune mechanism and Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to D89.84.

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
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about D89.84

Is D89.84 billable?

Yes. D89.84 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can D89.84 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict D89.84 as a principal diagnosis.

Is D89.84 a CC or MCC?

No. D89.84 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does D89.84 group to?

D89.84 is used in the MS-DRG v44.0 logic for MS-DRG 814 (Reticuloendothelial and Immunity Disorders with MCC), MS-DRG 815 (Reticuloendothelial and Immunity Disorders with CC) and MS-DRG 816 (Reticuloendothelial and Immunity Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.