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E08.620 ICD-10-CM Code: Diabetes mellitus due to underlying condition with diabetic dermatitis

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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Diabetes mellitus (E08-E13)

E08.620

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Diabetes mellitus due to underlying condition with diabetic dermatitis

Diabetes caused by another medical condition that results in diabetic dermatitis, an inflammatory skin condition.

Buddy the Bee presenting code insight

Buddy Insight

Diabetes mellitus due to an underlying condition with diabetic dermatitis represents skin inflammatory conditions directly caused by secondary diabetes, including necrobiosis lipoidica diabeticorum, diabetic dermopathy (shin spots), granuloma annulare, and acanthosis nigricans associated with insulin resistance.

CMS-HCC V28

HCC 37

RAF 0.166

CMS-HCC V24

HCC 18

RAF 0.302

ACA/HHS

HCC 20

Varies by metal level

ESRD/PACE

HCC 18

RAF 0.084

RXHCC

HCC 30

RAF 0.495

Code Book Path

Official
E08.6Diabetes mellitus due to underlying condition with other specified complications
E08.62Diabetes mellitus due to underlying condition with skin complications
E08.620Diabetes mellitus due to underlying condition with diabetic dermatitis

Inclusion Terms

Official
  • Diabetes mellitus due to underlying condition with diabetic necrobiosis lipoidica

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for E08.620 in this effective period.

Related Child Codes

Official
E08.621Diabetes mellitus due to underlying condition with foot ulcer
E08.622Diabetes mellitus due to underlying condition with other skin ulcer
E08.628Diabetes mellitus due to underlying condition with other skin complications

Includes

Official

ICD-10-CM does not list Includes notes for E08.620 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for E08.620 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for E08.620 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for E08.620 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for E08.620 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Document the underlying condition causing diabetes, the specific dermatologic manifestation, its location and extent, biopsy results if performed, and the causal relationship to diabetes.
Record whether the dermatitis is active or quiescent, treatment provided, and glycemic control status as it relates to skin disease activity.

MEAT Support

HCC Buddy guidance
Document the underlying condition causing diabetes, the specific dermatologic manifestation, its location and extent, biopsy results if performed, and the causal relationship to diabetes.
Record whether the dermatitis is active or quiescent, treatment provided, and glycemic control status as it relates to skin disease activity.

Audit Caution

HCC Buddy guidance
Distinguish diabetic dermatitis from unrelated dermatologic conditions in diabetic patients.
Necrobiosis lipoidica diabeticorum occurs in less than 1% of diabetic patients but is highly specific for diabetes when present.
Diabetic dermopathy (shin spots) is the most common diabetic skin finding but is often underreported.

Common Mistakes

HCC Buddy guidance
E08.621: Diabetic foot ulcer — a specific skin complication, not classified as dermatitis
E08.622: Diabetic other skin ulcer — use for non-foot ulceration
E08.628: Other diabetic skin complications — use for skin manifestations not classified as dermatitis

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 E08.620 an HCC code?

Yes. E08.620 (Diabetes mellitus due to underlying condition with diabetic dermatitis) maps to Diabetes with Chronic Complications under the CMS-HCC V28 risk adjustment model (and Diabetes with Chronic Complications under V24), with a community non-dual aged RAF of 0.166. It is billable for payment year 2026.

Coder answer: E08.620 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
E08.620
Description
Diabetes mellitus due to underlying condition with diabetic dermatitis
HCC (V28)
HCC 37 — Diabetes with Chronic Complications
RAF
0.166
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 37, Diabetes with Chronic Complications
0.166
V24HCC 18, Diabetes with Chronic Complications
0.302
ESRDHCC 18, Diabetes with Chronic Complications
0.084
RxHCCHCC 30, Diabetes with Complications
0.495

Each model's RAF is its CMS base weight for that model's standard population, so 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 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.

Work E08.620 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for E08.620

For E08.620 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 E08.620 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

E08.620 is the ICD-10-CM diagnosis code for diabetes mellitus due to underlying condition with diabetic dermatitis. Diabetes caused by another medical condition that results in diabetic dermatitis, an inflammatory skin condition. E08.620 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, E08.620 maps to Diabetes with Chronic Complications (HCC 37) with a community, non-dual, aged base RAF weight of 0.166. Under the older V24 model, E08.620 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.

Document the underlying cause of diabetes to support E08 category selection. Because E08.620 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 E08.620 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Document the underlying cause of diabetes to support E08 category selection
  • •Distinguish between diabetic dermatitis and other skin conditions like necrobiosis lipoidica

Clinical Significance

Diabetes mellitus due to an underlying condition with diabetic dermatitis represents skin inflammatory conditions directly caused by secondary diabetes, including necrobiosis lipoidica diabeticorum, diabetic dermopathy (shin spots), granuloma annulare, and acanthosis nigricans associated with insulin resistance. These dermatologic manifestations serve as visible markers of underlying metabolic disease and may indicate inadequate glycemic control. Necrobiosis lipoidica, though uncommon, can cause significant skin breakdown and ulceration.

Documentation Requirements

  • ✓Document the underlying condition causing diabetes, the specific dermatologic manifestation, its location and extent, biopsy results if performed, and the causal relationship to diabetes.
  • ✓Record whether the dermatitis is active or quiescent, treatment provided, and glycemic control status as it relates to skin disease activity.

Commonly Confused Codes

  • •E08.621: Diabetic foot ulcer: a specific skin complication, not classified as dermatitis
  • •E08.622: Diabetic other skin ulcer: use for non-foot ulceration
  • •E08.628: Other diabetic skin complications: use for skin manifestations not classified as dermatitis

Child Codes

E08.620Diabetes mellitus due to underlying condition with diabetic dermatitis
HCC 37
E08.621Diabetes mellitus due to underlying condition with foot ulcer
HCC 37
E08.622Diabetes mellitus due to underlying condition with other skin ulcer
HCC 37
E08.628Diabetes mellitus due to underlying condition with other skin complications
HCC 37

Code Hierarchy

└E08Diabetes mellitus due to underlying condition└E08.6Diabetes mellitus due to underlying condition with other specified complications└E08.62Diabetes mellitus due to underlying condition with skin complications└E08.620Diabetes mellitus due to underlying condition with diabetic dermatitis
└E08.620Diabetes mellitus due to underlying condition with diabetic dermatitis

Because E08.620 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

E08.620 maps to CMS-HCC V28 category 37, Diabetes with Chronic Complications. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. Because E08.620 carries a payment HCC, you can see what it adds to a RAF score and check the documentation the chart needs before it is submitted.

Work E08.620 in HCC Buddy

Open E08.620 in the Code Book for the full Index-to-Tabular path, MEAT checklist, and V28 HCC mapping, or in the Encoder to code from a keyword search. Pro includes 7 days to try everything, no card required.

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