Medical Coding for Pressure Ulcers

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. In fact, the accuracy of Medical Coding for Pressure Ulcers impacts quality reporting, reimbursement, HCC risk adjustment, and hospital-acquired condition (HAC) tracking.

For this reason, accuracy is critical for coders.

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.

For example, common locations include:

• Sacrum

• Heels

• Hips

• Elbows

• Ankles

• Occiput (back of head)

ICD-10-CM Category: L89

Pressure Ulcer Codes

Specifically, coders assign pressure ulcer codes from Category L89 in ICD-10-CM.

Also, these codes are based on:

1. Anatomical site

2. Laterality

3. Stage

Therefore, the record must document all three components. However, the guidelines allow coders to take the stage from other clinicians, such as nurses.

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

• As a result, the 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

In other words, pressure ulcer codes are combination codes that include:

• Location

• Laterality

• Stage

For example, the code structure looks like this:
L89.1__ (Back)
L89.6__ (Heel)

If the Stage Is Not Documented

• In this case, 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

• In that case, do NOT code a healed pressure ulcer.

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

Present on Admission (POA)

Also, hospitals must report POA indicators.

As a result, this impacts:

• Quality metrics

• Hospital-acquired condition reporting

• Reimbursement

Coding Tips for Pressure Ulcers

Always Look for:

• Exact site

• Laterality (right or left)

• 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 code, plus an additional L97 or L98.4 code for the ulcer)

Therefore, coders assign them different codes.

Infection with Pressure Ulcer

If provider documents:

• Pressure ulcer with cellulitis

• Pressure ulcer with osteomyelitis

In that case, code:

1. L89 code first

2. Additional code for infection

Also, follow sequencing guidelines based on documentation.

Common Coding Errors

• Coding only the highest stage when an ulcer progressed during an inpatient stay (instead, code the stage on admission and 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

In particular, Stage 3 and Stage 4 pressure ulcers:

• May affect MS-DRG assignment

• May qualify as MCC/CC in an inpatient setting

• Also impact quality reporting and penalties

Therefore, accurate staging matters.

Real-World Documentation Tips for Coders

To that end, 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

For example, the documentation reads:
“Stage 3 pressure ulcer of the right heel, present on admission.”

In that case, code:

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

Final Clarified Tip

However, pressure ulcer coding is not just about selecting L89.
It also 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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