D89.813 ICD-10-CM Code: Graft-versus-host disease, unspecified
D89.813 maps to CMS-HCC V28 454. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) / Certain disorders involving the immune mechanism (D80-D89)
D89.813
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceGraft-versus-host disease, unspecified
A condition where immune cells from a donor attack the recipient's body after a bone marrow or stem cell transplant, but the specific type or severity is not documented.
Buddy Insight
Graft-versus-host disease, unspecified, is used when the provider documents graft-versus-host disease without specifying whether the presentation is acute, chronic, or overlap.
CMS-HCC V28
MappedHCC 454
Coefficient HCC 454: 1.068 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 251
Code-level coefficient reference
ESRD/PACE
MappedHCC 47
Code-level coefficient reference
RXHCC
MappedHCC 395
Code-level coefficient reference
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for D89.813. Check the code and parent instructions in the Code Book.
Excludes 2
Official- autoimmune disease (systemic) NOS (M35.9)Inherited from D50-D89, D89
- certain conditions originating in the perinatal period (P00-P96)Inherited from D50-D89, D89
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from D50-D89, D89
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from D50-D89, D89
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from D50-D89, D89
- human immunodeficiency virus [HIV] disease (B20)Inherited from D50-D89, D89
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from D50-D89, D89
- neoplasms (C00-D49)Inherited from D50-D89, D89
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from D50-D89, D89
- transplant failure and rejection (T86.-)Inherited from D50-D89, D89
Related Codes
Includes
Official- defects in the complement systemInherited from D80-D89
- immunodeficiency disorders, except human immunodeficiency virus [HIV] diseaseInherited from D80-D89
- sarcoidosisInherited from D80-D89
Excludes 1
Official- autoimmune disease (systemic) NOS (M35.9)Inherited from D80-D89, D89
- functional disorders of polymorphonuclear neutrophils (D71-)Inherited from D80-D89, D89
- human immunodeficiency virus [HIV] disease (B20)Inherited from D80-D89, D89
- hyperglobulinemia NOS (R77.1)Inherited from D80-D89, D89
- monoclonal gammopathy (of undetermined significance) (D47.2)Inherited from D80-D89, D89
Code First
Official- underlying cause, such as:Inherited from D89.81
- complications of transplanted organs and tissue (T86.-)Inherited from D89.81
- complications of blood transfusion (T80.89)Inherited from D89.81
Use Additional
Official- code to identify associated manifestations, such as:Inherited from D89.81
- desquamative dermatitis (L30.8)Inherited from D89.81
- diarrhea (R19.7)Inherited from D89.81
- elevated bilirubin (R17)Inherited from D89.81
- hair loss (L65.9)Inherited from D89.81
Code Also
OfficialNo Code Also instructions are included in this display for D89.813. 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 D89.813 an HCC code?
Yes. D89.813 (Graft-versus-host disease, unspecified) maps to HCC 454, Stem Cell, Including Bone Marrow, Transplant Status/Complications under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 1.068. 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: D89.813 is billable and maps to V28 HCC 454, Stem Cell, Including Bone Marrow, Transplant Status/Complications. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- D89.813
- Description
- Graft-versus-host disease, unspecified
- HCC (V28)
- HCC 454 — Stem Cell, Including Bone Marrow, Transplant Status/Complications
- RAF reference coefficient
- 1.068
- 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 D89.813 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for D89.813
For D89.813, 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
Get the V28 mapping + MEAT cheat sheet
One printable reference: check representative V28 mappings and the documentation reminders your note needs. Free, no card.
Free PDF. No card. Unsubscribe anytime.
What This Code Means
D89.813 is the ICD-10-CM diagnosis code for graft-versus-host disease, unspecified. A condition where immune cells from a donor attack the recipient's body after a bone marrow or stem cell transplant, but the specific type or severity is not documented. D89.813 sits in the ICD-10-CM chapter for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (d50-d89), within the section covering certain disorders involving the immune mechanism (d80-d89).
Under the CMS-HCC V28 risk adjustment model, D89.813 maps to Stem Cell, Including Bone Marrow, Transplant Status/Complications (HCC 454) with a source-labeled community, non-dual, aged reference coefficient of 1.068. 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.
Query the provider for more specificity regarding the organ(s) involved (skin, GI tract, liver, etc.) as there are more specific codes available. For D89.813, 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 D89.813 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Query the provider for more specificity regarding the organ(s) involved (skin, GI tract, liver, etc.) as there are more specific codes available
- •This code should only be used when the type of GVHD cannot be determined from the medical record
Clinical Significance
Graft-versus-host disease, unspecified, is used when the provider documents graft-versus-host disease without specifying whether the presentation is acute, chronic, or overlap. While this code captures the condition, it lacks the clinical specificity needed for optimal risk stratification and clinical communication. It most commonly appears in initial encounters before full clinical characterization.
Documentation Requirements
- ✓While this code technically requires only a documented diagnosis of graft-versus-host disease following transplantation, best practice calls for the provider to specify acute versus chronic presentation.
- ✓Documentation should include the temporal relationship to transplant, affected organ systems, severity, and current treatment.
- ✓Query the provider to classify as acute (D89.810), chronic (D89.811), or overlap (D89.812) whenever possible.
Commonly Confused Codes
- •D89.810 (Acute graft-versus-host disease), D89.811 (Chronic graft-versus-host disease), and D89.812 (Acute on chronic graft-versus-host disease) are all more specific alternatives.
- •T86.00-T86.09 (Complications of bone marrow transplant) captures other transplant complications.
- •Z94.84 (Bone marrow transplant status) should be coded additionally but does not replace the graft-versus-host disease code.