E11.00 ICD-10-CM Code: Type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
E11.00 maps to CMS-HCC V28 36. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC Buddy coding tools
HCC Buddy Code Card
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)
E11.00
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceType 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
Type 2 diabetes with very high blood sugar and blood osmolarity (salt concentration) but without the patient being in a coma.
Buddy Insight
Type 2 diabetes mellitus with hyperosmolarity without coma is a serious acute metabolic decompensation where extreme hyperglycemia causes dangerously high blood osmolarity, leading to severe dehydration.
CMS-HCC V28
MappedHCC 36
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 019
Code-level coefficient reference
ESRD/PACE
MappedHCC 17
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 E11.00 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for E11.00 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for E11.00 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for E11.00 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for E11.00 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for E11.00 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for E11.00 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 E11.00 an HCC code?
Yes. E11.00 (Type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)) maps to HCC 36, Diabetes with Severe Acute 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: E11.00 is billable and maps to V28 HCC 36, Diabetes with Severe Acute Complications. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- E11.00
- Description
- Type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)
- HCC (V28)
- HCC 36 — Diabetes with Severe Acute 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 E11.00 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT Criteria for E11.00
For E11.00 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 E11.00 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
E11.00 is the ICD-10-CM diagnosis code for type 2 diabetes mellitus with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (nkhhc). Type 2 diabetes with very high blood sugar and blood osmolarity (salt concentration) but without the patient being in a coma. E11.00 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, E11.00 maps to Diabetes with Severe Acute Complications (HCC 36) with a source-labeled community, non-dual, aged reference coefficient of 0.166. No V24 mapping is shown for E11.00; 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.
Hyperosmolarity is a serious condition; document blood glucose and osmolarity levels when available. Because E11.00 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 E11.00 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Hyperosmolarity is a serious condition; document blood glucose and osmolarity levels when available
- •Distinguish from E11.01 which indicates the patient is in a coma from this condition
Clinical Significance
Type 2 diabetes mellitus with hyperosmolarity without coma is a serious acute metabolic decompensation where extreme hyperglycemia causes dangerously high blood osmolarity, leading to severe dehydration. This condition, known as hyperosmolar hyperglycemic state, typically occurs in elderly Type 2 diabetic patients and carries mortality rates of 10-20%. Unlike diabetic ketoacidosis, significant ketone production is usually absent.
Documentation Requirements
- ✓Documentation must confirm Type 2 diabetes with hyperosmolarity and explicitly state the patient is not in a coma.
- ✓Blood glucose levels (often exceeding 600 mg/dL), serum osmolarity values, and hydration status should be recorded.
- ✓The precipitating cause (infection, medication non-adherence, new diagnosis) and treatment with aggressive fluid resuscitation should be documented.
Commonly Confused Codes
- •E11.01 (with coma) is used when the patient loses consciousness from hyperosmolarity.
- •E11.10/E11.11 (ketoacidosis without/with coma) involve acidosis from ketone production, a different pathophysiology.
- •E11.65 (hyperglycemia) is for elevated blood glucose without the severity of hyperosmolar state.