L88
BillablePyoderma gangrenosum
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is L88 an HCC code?
Yes. L88 maps to Pemphigus and Other Autoimmune Skin Conditions under the CMS-HCC V28 risk adjustment model.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. 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.
MEAT Criteria for L88
For L88to 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 L88 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
L88 is the ICD-10-CM diagnosis code for pyoderma gangrenosum. A rare, severe skin condition characterized by rapidly developing painful ulcers that can destroy tissue, often associated with inflammatory bowel disease or other systemic conditions. L88 sits in the ICD-10-CM chapter for diseases of the skin and subcutaneous tissue (l00-l99), within the section covering other disorders of the skin and subcutaneous tissue (l80-l99).
Under the CMS-HCC V28 risk adjustment model, L88 maps to Pemphigus and Other Autoimmune Skin Conditions (HCC 387) with a community, non-dual, aged base RAF weight of 0.262. L88 was not retained as a payment HCC under the older V24 model, so V28 introduced or recategorized it during the 2024–2026 phase-in. 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.
Always investigate and code any associated systemic conditions (such as inflammatory bowel disease) as secondary diagnoses. Because L88 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 L88 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always investigate and code any associated systemic conditions (such as inflammatory bowel disease) as secondary diagnoses
- •Document the location and extent of ulceration for complete clinical picture
Clinical Significance
Pyoderma gangrenosum is a rare neutrophilic dermatosis characterized by rapidly progressive, painful ulcers with undermined violaceous borders. It is clinically significant because it is frequently associated with systemic diseases (inflammatory bowel disease, rheumatoid arthritis, hematologic malignancies) and exhibits pathergy, where trauma or surgery worsens the condition. Misdiagnosis leading to surgical debridement can be devastating.
Documentation Requirements
- ✓Provider documentation of pyoderma gangrenosum diagnosis
- ✓Clinical description of ulcer characteristics (undermined borders, violaceous rim)
- ✓Biopsy results (neutrophilic infiltration, exclusion of infection and malignancy)
- ✓Assessment for associated systemic conditions (inflammatory bowel disease, hematologic disorders, arthritis)
- ✓Current treatment plan (immunosuppression, wound care)
- ✓Documentation of pathergy phenomenon if present
- ✓Evidence the condition was actively managed during the encounter
Excludes 1 — Do NOT code together
- dermatitis gangrenosa (L08.0)
Commonly Confused Codes
- •L97.909 (Non-pressure chronic ulcer of unspecified site) — non-specific ulcer; use L88 when pyoderma gangrenosum is diagnosed
- •L89.x (Pressure ulcer) — different mechanism; pressure ulcers result from sustained pressure on tissue
- •I83.0 (Varicose veins with ulcer) — venous ulcers have different characteristics and etiology
- •L08.0 (Pyoderma) — infectious pyoderma is completely different from the autoimmune pyoderma gangrenosum