February 17, 2026
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Medical Coding for Pressure Ulcers

AAPC | Certification | Certified Medical Coder | CPC | Medical Coding
By Janine Mothershed

Stages, Guidelines & Coding Tips (ICD-10-CM)

Pressure ulcers (also called pressure injuries or decubitus ulcers) are a high-risk, high-scrutiny diagnosis in medical coding. The accuracy of Medical Coding for Pressure Ulcers impacts quality reporting, reimbursement, HCC risk adjustment, and hospital-acquired condition (HAC) tracking.

For coders, accuracy is critical.

What Is a Pressure Ulcer?

A pressure ulcer is localized damage to the skin and/or underlying tissue, usually over a bony prominence, caused by prolonged pressure or pressure combined with shear.

Common locations:

  • Sacrum

  • Heels

  • Hips

  • Elbows

  • Ankles

  • Occiput (back of head)

ICD-10-CM Category: L89

Pressure Ulcer Codes

Pressure ulcers are coded from Category L89 in ICD-10-CM.

Codes are based on:

  1. Anatomical site

  2. Laterality

  3. Stage

All three components must be documented.

Pressure Ulcer Stages (Clinical & Coding Overview)

Stage 1

  • Non-blanchable erythema

  • Intact skin

Stage 2

  • Partial-thickness skin loss

  • Blister or shallow open ulcer

Stage 3

  • Full-thickness skin loss

  • Subcutaneous fat visible

  • No exposed bone, tendon, or muscle

Stage 4

  • Full-thickness tissue loss

  • Exposed bone, tendon, or muscle

Unstageable

  • Covered by slough or eschar

  • Depth cannot be determined

Deep Tissue Pressure Injury (DTPI)

  • Persistent non-blanchable deep red, maroon, or purple discoloration

ICD-10-CM Official Guidelines Highlights

Code Site + Stage Together

Pressure ulcer codes are combination codes that include:

  • Location

  • Laterality

  • Stage

Example structure:
L89.1__ (Upper back)
L89.6__ (Heel)

If the Stage Is Not Documented

  • Assign the unspecified stage code

  • BUT this often triggers payer scrutiny

Tip: Query when appropriate.

If Ulcer Progresses to a Higher Stage

If a patient is admitted to an inpatient hospital with a pressure ulcer at one stage and it progresses to a higher stage, two separate codes should be assigned: one code for the site and stage of the ulcer on admission and a second code for the same ulcer site and the highest stage reported during the stay

If Healed at Time of Encounter

  • Do NOT code a healed pressure ulcer.

  • If healing but still present, code the documented stage.

Present on Admission (POA)

Hospitals must report POA indicators.

This impacts:

  • Quality metrics

  • Hospital-acquired condition reporting

  • Reimbursement

Coding Tips for Pressure Ulcers

Always Look for:

  • Exact site

  • Laterality (right, left, bilateral)

  • Stage

  • POA status (facility setting)

  • Documentation of infection (if present)

Do Not Confuse:

  • Pressure ulcer

  • Non-pressure chronic ulcer (L97 category)

  • Diabetic ulcer (E08–E13 with L97 combination)

They are coded differently.

Infection with Pressure Ulcer

If provider documents:

  • Pressure ulcer with cellulitis

  • Pressure ulcer with osteomyelitis

Code:

  1. L89 code first

  2. Additional code for infection

Follow sequencing guidelines based on documentation.

Common Coding Errors

  • Coding both Stage 2 and Stage 3 when the ulcer progressed (only the highest stage)

  • Forgetting laterality

  • Using an unspecified stage when documentation supports specificity

  • Coding healed ulcers

  • Missing deep tissue pressure injury classification

Risk Adjustment & Reimbursement Impact

Stage 3 and Stage 4 pressure ulcers:

  • May affect MS-DRG assignment

  • May qualify as MCC/CC in an inpatient setting

  • Impact quality reporting and penalties

Accurate staging matters.

Real-World Documentation Tips for Coders

Encourage providers to document:

  • Exact location (right heel vs heel)

  • Stage

  • If present on admission

  • If associated with infection

  • If due to the device (medical device-related pressure injury)

Quick Coding Example

Documentation:
“Stage 3 pressure ulcer of the right heel, present on admission.”

Code:
L89.613 – Pressure ulcer of right heel, stage 3

Final Clarified Tip

Pressure ulcer coding is not just about selecting L89.
It requires:

  • Understanding staging

  • Applying ICD-10-CM guidelines

  • Monitoring documentation accuracy

  • Knowing quality reporting implications

When in doubt — query for clarity.

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