E10.620 ICD-10-CM Code: Type 1 diabetes mellitus with diabetic dermatitis
E10.620 maps to CMS-HCC V28 37. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)
E10.620
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceType 1 diabetes mellitus with diabetic dermatitis
Type 1 diabetes with diabetic dermatitis, an inflammatory skin condition caused by diabetes affecting the skin's integrity.
Buddy Insight
Diabetic dermatitis in Type 1 diabetes mellitus represents inflammatory skin changes directly attributable to diabetes, including conditions such as necrobiosis lipoidica diabeticorum, diabetic dermopathy, or granuloma annulare.
CMS-HCC V28
MappedHCC 37
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
MappedHCC 30
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Type 1 diabetes mellitus with diabetic necrobiosis lipoidica
Excludes 2
OfficialNo Excludes 2 notes are included in this display for E10.620. Check the code and parent instructions in the Code Book.
Related Codes
Includes
Official- brittle diabetes (mellitus)Inherited from E10
- diabetes (mellitus) due to autoimmune processInherited from E10
- diabetes (mellitus) due to immune mediated pancreatic islet beta-cell destructionInherited from E10
- idiopathic diabetes (mellitus)Inherited from E10
- juvenile onset diabetes (mellitus)Inherited from E10
- ketosis-prone diabetes (mellitus)Inherited from E10
Excludes 1
Official- transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89, E10
- diabetes mellitus due to underlying condition (E08.-)Inherited from E00-E89, E10
- drug or chemical induced diabetes mellitus (E09.-)Inherited from E00-E89, E10
- gestational diabetes (O24.4-)Inherited from E00-E89, E10
- hyperglycemia NOS (R73.9)Inherited from E00-E89, E10
- neonatal diabetes mellitus (P70.2)Inherited from E00-E89, E10
- postpancreatectomy diabetes mellitus (E13.-)Inherited from E00-E89, E10
- postprocedural diabetes mellitus (E13.-)Inherited from E00-E89, E10
- secondary diabetes mellitus NEC (E13.-)Inherited from E00-E89, E10
- type 2 diabetes mellitus (E11.-)Inherited from E00-E89, E10
Code First
OfficialNo Code First sequencing instructions are included in this display for E10.620. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for E10.620. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for E10.620. 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 E10.620 an HCC code?
Yes. E10.620 (Type 1 diabetes mellitus with diabetic dermatitis) maps to HCC 37, Diabetes with Chronic 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: E10.620 is billable and maps to V28 HCC 37, Diabetes with Chronic Complications. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- E10.620
- Description
- Type 1 diabetes mellitus with diabetic dermatitis
- HCC (V28)
- HCC 37 — Diabetes with Chronic 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 E10.620 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for E10.620
For E10.620, 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
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What This Code Means
E10.620 is the ICD-10-CM diagnosis code for type 1 diabetes mellitus with diabetic dermatitis. Type 1 diabetes with diabetic dermatitis, an inflammatory skin condition caused by diabetes affecting the skin's integrity. E10.620 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, E10.620 maps to Diabetes with Chronic Complications (HCC 37) with a source-labeled community, non-dual, aged reference coefficient of 0.166. No V24 mapping is shown for E10.620; use the applicable model and payment year when reviewing the V28 mapping. 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.
Distinguish dermatitis from other skin complications like ulcers; dermatitis involves inflammation without necessarily breaking the skin. For E10.620, 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 E10.620 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Distinguish dermatitis from other skin complications like ulcers; dermatitis involves inflammation without necessarily breaking the skin
- •Document the location and severity of the dermatitis
Clinical Significance
Diabetic dermatitis in Type 1 diabetes mellitus represents inflammatory skin changes directly attributable to diabetes, including conditions such as necrobiosis lipoidica diabeticorum, diabetic dermopathy, or granuloma annulare. These skin manifestations can indicate poor glycemic control and systemic microvascular involvement. While often less severe than ulcerative complications, they signal ongoing tissue damage requiring dermatological management.
Documentation Requirements
- ✓Documentation must identify the specific dermatitis condition and establish its causal relationship to Type 1 diabetes.
- ✓The provider should record the location, appearance, extent, and any associated symptoms.
- ✓Biopsy results, if obtained, should be included.
- ✓The record must distinguish dermatitis (inflammatory skin changes) from skin ulceration, which uses different codes.
Commonly Confused Codes
- •E10.621 (foot ulcer) and E10.622 (other skin ulcer) represent open wound complications rather than inflammatory skin conditions.
- •E10.628 (other skin complications) covers skin manifestations not classified as dermatitis.
- •L30.9 (dermatitis, unspecified) should not replace this combination code when the condition is diabetic in origin.