E10.621
BillableType 1 diabetes mellitus with foot ulcer
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is E10.621 an HCC code?
No. E10.621 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
E10.621 is the ICD-10-CM diagnosis code for type 1 diabetes mellitus with foot ulcer. Type 1 diabetes with an open sore or ulcer on the foot caused by diabetes, which can be difficult to heal due to poor circulation and nerve damage. E10.621 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering diabetes mellitus (e08-e13).
E10.621 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
This code does not map to an HCC in any model (V28, V24, ESRD, or RxHCC). Coders should ensure all other applicable diabetic complication codes and ulcer severity codes are captured to reflect the true disease burden. Look for concurrent neuropathy or peripheral vascular disease documentation that may map to HCCs.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for E10.621 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Foot ulcers are a serious complication; document location, depth, and whether it involves bone or deeper structures
- •Coordinate with wound care codes and monitor for infection or gangrene development
Clinical Significance
Type 1 diabetes mellitus with foot ulcer is a serious complication reflecting the convergence of peripheral neuropathy, peripheral vascular disease, and impaired immune function. Diabetic foot ulcers are the leading cause of non-traumatic lower extremity amputations and represent a significant source of morbidity, hospitalization, and healthcare costs. These ulcers require multidisciplinary management including wound care, offloading, vascular assessment, and glycemic optimization.
Documentation Requirements
- ✓Documentation must specify the presence of a foot ulcer in a patient with Type 1 diabetes.
- ✓The provider should record the ulcer location, size, depth (using the Wagner or University of Texas classification), presence of infection, and exposed structures.
- ✓An additional code from L97 should be assigned to specify the ulcer site and severity.
- ✓Vascular status and neuropathy assessment should be documented.