Is D89.812 a billable ICD-10-CM code?

Yes. D89.812 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does D89.812 sit in the tabular list?

Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Certain disorders involving the immune mechanism (D80-D89).

What cannot be coded together with D89.812?

D89.812 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above D89.812 (D89) and apply to it just the same.

D89.812

D89.812 — Acute on chronic graft-versus-host disease

Billable / specific codeICD-10-CM

D89.812 is a billable, specific ICD-10-CM code for acute on chronic graft-versus-host disease. It is valid for submission on a claim.

Excludes1 inherited from the categories above D89.812

These are not written on D89.812, but they bind it: a note on a category applies to every code beneath it. Billing D89.812 with anything listed here is a denial.

Written on D89 — Other disorders involving the immune mechanism, not elsewhere classified

hyperglobulinemia NOS (R77.1)
monoclonal gammopathy (of undetermined significance) (D47.2)

Excludes2 inherited from the categories above D89.812

Also inherited, and the opposite of Excludes1: these conditions are not part of D89.812, but a patient can have both, so you may code both.

Written on D89 — Other disorders involving the immune mechanism, not elsewhere classified

transplant failure and rejection (T86.-)

Risk adjustment

D89.812 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 454 Stem Cell, Including Bone Marrow, Transplant Status/Complications1.068 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

D89.812 is named in 26 Medicare coverage policies — 26 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52423Billing and Coding: Infliximab and biosimilars
A55717Billing and Coding: Lab: Flow Cytometry
A56464Billing and Coding: Flow Cytometry
A56638Billing and Coding: Gastrointestinal Pathogen (GIP) Panels Utilizing Multiplex Nucleic Acid Amplification Techniques (NAATs)

How D89.812 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D89.812.

Graft-versus-host disease›acute on chronic
Disease, diseased›graft-versus-host›acute on chronic
Disease, diseased›host-versus-graft›acute on chronic

Code history

D89.812 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share D89.81. If D89.812 is not quite right, the correct code is usually one of these.

Questions about D89.812

Is D89.812 a billable ICD-10-CM code?: Yes. D89.812 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does D89.812 sit in the tabular list?: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Certain disorders involving the immune mechanism (D80-D89).
What cannot be coded together with D89.812?: D89.812 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above D89.812 (D89) and apply to it just the same.