Z86.31 is a specific ICD-10-CM code utilized to document a patient's historical medical history of a diabetic foot ulcer (DFU). In clinical practice, this code signifies that while the ulcer is currently resolved or healed, the patient remains at an exceptionally high risk for recurrence. A history of DFU is considered one of the primary risk factors for future ulceration, with recurrence rates estimated at roughly 40% within the first year after healing. The existence of a prior ulcer indicates significant underlying diabetic complications, most notably peripheral sensory neuropathy (loss of protective sensation), autonomic neuropathy (causing dry skin and fissures), and often peripheral arterial disease (impaired micro- and macrocirculation). Clinical management for patients with this history focuses on aggressive secondary prevention, including daily foot inspections, specialized therapeutic footwear, regular professional podiatric evaluations, and optimized glycemic control to prevent complications such as cellulitis, osteomyelitis, and lower-extremity amputation.
Distinguish between active ulcers and history of ulcers to ensure HCC capture.
Example: Patient with Type 2 Diabetes Mellitus presents for foot exam. History includes a Stage 3 diabetic foot ulcer of the right heel, which fully healed 6 months ago. Current exam shows no active breakdown or drainage. Plan: Regular monitoring for recurrence. Coding: E11.9 (Type 2 diabetes mellitus without complications) and Z86.31 (Personal history of diabetic foot ulcer).
Billing Focus: Document that the previous ulcer is fully epithelialized and no longer requires active wound care to justify the history code.
Identify the specific anatomical site of the resolved ulcer in the history.
Example: Clinical documentation reflects a personal history of a diabetic ulcer specifically located on the left first metatarsal head. This anatomical specificity supports medical necessity for therapeutic shoe inserts (A5500).
Billing Focus: Laterality and specific foot location (e.g., heel, midfoot, metatarsal) should be specified in the narrative even if the code Z86.31 is not site-specific.
Document the underlying type of diabetes associated with the historical ulcer.
Example: Patient has a history of foot ulcers secondary to Type 1 Diabetes Mellitus with peripheral neuropathy. Past ulcer was located on the left lateral malleolus. Current skin is intact with hypertrophic scarring at the site.
Billing Focus: Always code the underlying diabetes mellitus (E10.- or E11.-) as the primary diagnosis followed by Z86.31.
Specify the presence of comorbid peripheral neuropathy or vascular disease.
Example: History of diabetic foot ulcer on right great toe. Patient currently has loss of protective sensation (LOPS) confirmed by 10g monofilament test and evidence of peripheral angiopathy.
Billing Focus: Linking the history of ulcer to current neuropathy (E11.40) or PVD (E11.51) justifies more frequent preventative podiatry visits.
Incorporate the status of any prior amputations related to the ulcer history.
Example: History of diabetic foot ulcer on left foot which resulted in a previous transmetatarsal amputation. Currently checking the stump for any new pressure points or signs of breakdown.
Billing Focus: Combine Z86.31 with Z89.432 (Acquired absence of left foot below ankle) to provide a complete clinical picture of the patient's morbidity.
Used for routine follow-up of a diabetic patient with a history of ulcers where the risk is low but requires monitoring.
Used when the history of ulcers is combined with other chronic conditions like neuropathy or renal failure requiring complex management.
Preventative nail care in high-risk patients with a history of diabetic foot ulcers to prevent new skin breakdown.
Used to assess blood flow in patients with a history of diabetic ulcers to evaluate risk of recurrence due to ischemia.
While Z86.31 is history, this code is used if a patient with a history of ulcers develops a small new area of breakdown.
Deformity correction is often performed on patients with a history of ulcers to remove pressure points.
Patients with a history of ulcers often meet the criteria for LOPS evaluations.
Routine care is mandated for patients with a history of ulcers and sensory loss.
Used for deeper recurrences in patients with a significant history of chronic ulcers.
New patient evaluation where a history of diabetic ulcers indicates a high-risk status requiring complex planning.