E10.638
BillableType 1 diabetes mellitus with other oral complications
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is E10.638 an HCC code?
Yes. E10.638 maps to Diabetes with Chronic Complications under the CMS-HCC V28 risk adjustment model (and Diabetes with Chronic Complications under V24).
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 E10.638
For E10.638 to 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 E10.638 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
E10.638 is the ICD-10-CM diagnosis code for type 1 diabetes mellitus with other oral complications. Type 1 diabetes with complications affecting the mouth and teeth, such as gum disease or oral infections caused by high blood sugar. E10.638 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 CMS-HCC V28 risk adjustment model, E10.638 maps to Diabetes with Chronic Complications (HCC 37) with a community, non-dual, aged base RAF weight of 0.245. Under the older V24 model, E10.638 mapped to the same category but with a base RAF weight of 0.302 — V28 recalibrated weights across the entire model. 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.
Specify the type of oral complication when documented (gingivitis, periodontitis, etc.) for more precise coding. Because E10.638 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 E10.638 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Specify the type of oral complication when documented (gingivitis, periodontitis, etc.) for more precise coding
- •Ensure documentation clearly links the oral condition to diabetes rather than coding it separately
Clinical Significance
Type 1 diabetes mellitus with other oral complications encompasses diabetes-related mouth conditions beyond periodontal disease, including oral candidiasis, xerostomia (dry mouth), burning mouth syndrome, and delayed oral wound healing. These complications arise from microvascular damage, immune dysfunction, and altered salivary composition associated with chronic hyperglycemia. They can significantly impact nutrition, quality of life, and medication adherence.
Documentation Requirements
- ✓The provider must identify the specific oral complication and establish its relationship to Type 1 diabetes.
- ✓Documentation should describe the oral condition, its impact on function (eating, speaking), and any treatment provided.
- ✓The record must confirm the condition is not periodontal disease (E10.630), which has its own specific code.