E11.8 ICD-10-CM Code: Type 2 diabetes mellitus with unspecified complications
E11.8 maps to CMS-HCC V28 38. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)
E11.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceType 2 diabetes mellitus with unspecified complications
Type 2 diabetes with complications that are not specifically identified or classified elsewhere.
Buddy Insight
E11.
CMS-HCC V28
MappedHCC 38
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 021
Code-level coefficient reference
ESRD/PACE
MappedHCC 18
Code-level coefficient reference
RXHCC
MappedHCC 30
Code-level coefficient reference
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for E11.8 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for E11.8 in this effective period.
Related Child Codes
Includes
Official- diabetes (mellitus) due to insulin secretory defect
- diabetes NOS
- insulin resistant diabetes (mellitus)
Excludes 1
Official- diabetes mellitus due to underlying condition (E08.-)
- drug or chemical induced diabetes mellitus (E09.-)
- gestational diabetes (O24.4-)
- neonatal diabetes mellitus (P70.2)
- postpancreatectomy diabetes mellitus (E13.-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for E11.8 in this effective period.
Use Additional
Official- code to identify control using:
- injectable non-insulin antidiabetic drugs (Z79.85)
- insulin (Z79.4)
- oral antidiabetic drugs (Z79.84)
- oral hypoglycemic drugs (Z79.84)
Code Also
OfficialICD-10-CM does not list Code Also instructions for E11.8 in this effective period.
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 E11.8 an HCC code?
Yes. E11.8 (Type 2 diabetes mellitus with unspecified complications) maps to HCC 38, Diabetes with No, Glycemic, or Unspecified Complications under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.166. 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: E11.8 is billable and maps to V28 HCC 38, Diabetes with No, Glycemic, or Unspecified Complications. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- E11.8
- Description
- Type 2 diabetes mellitus with unspecified complications
- HCC (V28)
- HCC 38 — Diabetes with No, Glycemic, or Unspecified Complications
- RAF reference coefficient
- 0.166
- 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 E11.8 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT Criteria for E11.8
For E11.8 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 E11.8 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
E11.8 is the ICD-10-CM diagnosis code for type 2 diabetes mellitus with unspecified complications. Type 2 diabetes with complications that are not specifically identified or classified elsewhere. E11.8 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, E11.8 maps to Diabetes with No, Glycemic, or Unspecified Complications (HCC 38) with a source-labeled community, non-dual, aged reference coefficient of 0.166. No V24 mapping is shown for E11.8; use the applicable model and payment year when reviewing the V28 mapping. 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. 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.
Use this code only when the complication cannot be assigned to a more specific E11 code. Because E11.8 maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. 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 E11.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the complication cannot be assigned to a more specific E11 code
- •Document the nature of the complication clearly to support medical necessity and allow for future specificity
Clinical Significance
E11.8 represents type 2 diabetes mellitus with complications that are present but not further specified in the clinical documentation. This code signals that the patient's diabetes is not uncomplicated, yet the exact nature of the complication has not been identified or documented to the level of specificity available in the ICD-10-CM classification.
Documentation Requirements
- ✓Providers should be queried to specify the nature of the diabetic complication whenever possible, as this code reflects a lack of documentation specificity.
- ✓The record should at minimum state that a diabetes-related complication exists, even if it cannot be further classified.