E09.638 ICD-10-CM Code: Drug or chemical induced diabetes mellitus with other oral complications
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)
E09.638
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceDrug or chemical induced diabetes mellitus with other oral complications
Diabetes caused by medications or chemicals that affects the mouth and oral tissues, such as gum disease or other mouth complications.
Buddy Insight
Drug or chemical induced diabetes mellitus with other oral complications captures oral manifestations of drug-induced diabetes beyond periodontal disease.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
MappedHCC 18
RAF 0.302
ACA/HHS
00
RAF 0
ESRD/PACE
MappedHCC 18
RAF 0.0
RXHCC
MappedHCC 30
RAF 0.0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for E09.638 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for E09.638 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for E09.638 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for E09.638 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for E09.638 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for E09.638 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for E09.638 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is E09.638 an HCC code?
Yes. E09.638 maps to Diabetes with Chronic Complications under the V24 model but is not retained in V28.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for E09.638
For E09.638to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.
- 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
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed E09.638 during that encounter, not just copy-forwarded from a problem list.
What This Code Means
E09.638 is the ICD-10-CM diagnosis code for drug or chemical induced diabetes mellitus with other oral complications. Diabetes caused by medications or chemicals that affects the mouth and oral tissues, such as gum disease or other mouth complications. E09.638 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering diabetes mellitus (e08-e13).
Under the older CMS-HCC V24 model, E09.638 maps to Diabetes with Chronic Complications (HCC 18) with a community, non-dual, aged base RAF weight of 0.302. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Document the specific oral complication (e.g., gingivitis, periodontitis, or other oral manifestations). Because E09.638 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for E09.638 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the specific oral complication (e.g., gingivitis, periodontitis, or other oral manifestations)
- •Link the oral condition directly to the drug or chemical-induced diabetes
Clinical Significance
Drug or chemical induced diabetes mellitus with other oral complications captures oral manifestations of drug-induced diabetes beyond periodontal disease. This includes conditions such as oral candidiasis, xerostomia (dry mouth), burning mouth syndrome, lichen planus, and delayed wound healing after dental procedures. These oral complications can significantly impair nutrition, medication adherence, and quality of life.
Documentation Requirements
- ✓The causative drug or chemical must be identified.
- ✓The specific oral complication must be named and described, explaining why it is not periodontal disease (E09.630).
- ✓Oral examination findings from dental or medical evaluation should be documented.
- ✓The causal relationship between drug-induced diabetes and the oral condition must be established.
Commonly Confused Codes
- •E09.630 (periodontal disease) is more specific for gum disease.
- •K12-K14 (diseases of oral cavity) may be coded additionally.
- •B37.0 (oral candidiasis) should be coded separately if identified.
- •E09.69 (other specified complication) may be considered when oral findings are part of a multisystem presentation.