Get Ready for FY 2026: The Xylazine Coding Overhaul

As seasoned coders, we know that October 1st is always a big day, and Fiscal Year (FY) 2026 is bringing a significant update that we need to master: 116 new ICD-10-CM codes for chronic non-pressure skin ulcers. While we’re used to coding non-pressure ulcers related to diabetes, venous stasis, or even tape injuries, these new codes are a direct response to a growing national crisis: xylazine-induced skin ulcers.

This is more than just a list of new codes; it’s a crucial change to accurately track a serious public health issue, ensuring patients get the continued care and monitoring they desperately need. Let’s break down what’s changing and why the documentation is more critical than ever.

The “Tranq Dope” Factor: Why the New Codes?

The catalyst for this coding explosion, as discussed at the March 2024 ICD-10 Coordination and Maintenance Committee Meeting, is xylazine. This drug, approved only for veterinary sedation and pain relief, is now rampant as an additive, or “cut,” in illicit drugs like fentanyl.

What does this mean for us? When patients inject xylazine-containing drugs, they are experiencing a higher incidence of severe, necrotic skin wounds. These aren’t just minor sores—they are often full-thickness skin defects with progressive necrosis of the skin, muscle, tendon, and even bone.

The Essential Linkage

The new ulcer codes are tightly connected to the new toxic effect of xylazine subcategory: T65.84-. This is where your professional expertise shines. If the documentation links the ulcer to xylazine use, you must ensure you are capturing both codes.

• T65.84- (Toxic effect of xylazine): This is your primary linkage code.
• An Additional Code: A directive under T65.84- requires an additional code for associated manifestations, such as:
  • Abscesses, furuncles, and carbuncles (L02.-)
  • Cellulitis and acute lymphangitis (L03.-)
  • And, most importantly, the new non-pressure chronic ulcer codes (e.g., L97.-, and the brand-new L98.4- and L98.A- codes).

Example: A patient is admitted with a severe chronic ulcer on their right forearm due to a xylazine injection site. The physician documents “chronic necrotic ulcer, right forearm, due to xylazine use, with exposed fat layer.”

Your Coding:

1. T65.841A: Toxic effect of xylazine, accidental (unintentional), initial encounter.
2. L98.A212: Non-pressure chronic ulcer of right forearm with fat layer exposed.

Granularity is King: Mastering the New Ulcer Codes

The new codes in Chapter 12 (Diseases of the skin and subcutaneous tissue) are all about granularity of location and depth. The days of using an unspecified body site for an ulcer are fading fast, especially for these complex cases.

New Body Sites (L98.4-)

We’re seeing an expansion of the $\text{L98.4-}$ family, giving us specific codes for body areas that previously fell under “not elsewhere classified.” These are mostly six-digit codes:

• L98.43- $\to$ Non-pressure chronic ulcer of abdomen
• L98.44- $\to$ Non-pressure chronic ulcer of chest
• L98.45- $\to$ Non-pressure chronic ulcer of neck
• L98.46- $\to$ Non-pressure chronic ulcer of face
• L98.47- $\to$ Non-pressure chronic ulcer of groin

The Seven-Digit Depth Layer (L98.A-)

The brand-new L98.A- subcategory for non-pressure ulcers of the upper limb (upper arm, forearm, hand) is tiered based on the depth of the wound and will require seven digits. This is essential for tracking the severity and progression of these aggressive wounds.

The 7th digit is the key differentiator:

7th Digit	Description	Impact
1	Limited to breakdown of skin	Superficial
2	With fat layer exposed	Deeper, hitting the subcutaneous tissue
3	With necrosis of muscle	Tissue death is extending
4	With necrosis of bone	Most severe tissue death
5	With muscle involvement without necrosis	Muscle exposed but viable
6	With bone involvement without necrosis	Bone exposed but viable

Think of it this way: The 7th digit is a required modifier for the depth of tissue destruction.

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Example Code Breakdown:

• L98.A11 2 $\to$ Non-pressure chronic ulcer of right upper arm with fat layer exposed. (The 7th digit ‘2’ tells us exactly how deep this wound is.)

Comprehensive Coding for Complex Care

These patients often have significant comorbidities that complicate treatment, including bacteremia, endocarditis, sepsis, and withdrawal symptoms. Our job is to paint the complete picture.

If the conditions are not explicitly linked, send a query! We must capture the total severity of illness and the complexity of care.

 

Read also  Costochondritis ICD 10 Coding Guide

A Note on ICD-10-PCS

The update extends into the procedure side as well. Given how difficult these necrotic wounds are to treat, we’re getting eight new ICD-10-PCS codes for Negative Pressure Wound Therapy (NPWT), effective October 1, 2025. These will cover NPWT for both the integumentary and musculoskeletal systems.

OIG Scrutiny on Skin Substitutes

Finally, prepare for increased scrutiny from the OIG in FY 2026, specifically concerning wound care with skin substitutes. To support the medical necessity and proper payment:

• Documentation must clearly state: The exact measurements of the wound covered and the exact measurements of the skin substitute used.
• We must confirm: Clear indication of the depth of the wound, the tissues involved, and the quality of the wound bed.

As the healthcare landscape evolves, our role in accurate, granular coding becomes increasingly vital. Are you ready to dive into the new $\text{L98.4-}$ and $\text{L98.A-}$ series and master the xylazine linkage?