2026 ICD-10-CM Diagnosis Code T20.72XACorrosion of third degree of lip(s), initial encounter

ICD-10-CM Codes›S00–T88›T20-T25›T20

ICD-10-CM T20.72XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T20.72XA is a billable ICD-10-CM diagnosis code for corrosion of third degree of lip(s), initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 928 through 929. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Burn and corrosion, initial encounter.

Code Identity

ICD-10-CM Code
T20.72XA
Billable Status
Yes — Valid for Submission
Code Describes
Corrosion of third degree of lip(s), initial encounter
Short Description
Corrosion of third degree of lip(s), initial encounter
Same as the full description in the CMS dataset.
Parent Code
T20.72
Corrosion of third degree of lip(s)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT20-T25Burns and corrosions of external body surface, specified by site
CategoryT20Burn and corrosion of head, face, and neck
This CodeT20.72XACorrosion of third degree of lip(s), initial encounter

Coding GuidelinesGuidance

The ICD-10-CM makes a distinction between burns and corrosions. The burn codes are for thermal burns, except sunburns, that come from a heat source, such as a fire or hot appliance. The burn codes are also for burns resulting from electricity and radiation. Corrosions are burns due to chemicals. The guidelines are the same for burns and corrosions.

Sequence first the code that reflects the highest degree of burn when more than one burn is present.

  • When the reason for the admission or encounter is for treatment of external multiple burns, sequence first the code that reflects the burn of the highest degree.
  • When a patient has both internal and external burns, the circumstances of admission govern the selection of the principal diagnosis or first-listed diagnosis.
  • When a patient is admitted for burn injuries and other related conditions such as smoke inhalation and/or respiratory failure, the circumstances of admission govern the selection of the principal or first-listed diagnosis.

Current burns (T20-T25) are classified by depth, extent and by agent (X code). Burns are classified by depth as first degree (erythema), second degree (blistering), and third degree (full-thickness involvement).

Classify burns of the same local site (three-character category level, T20-T28) but of different degrees to the subcategory identifying the highest degree recorded in the diagnosis.

The appropriate 7th character is to be added to each code from block Burn and corrosion of head, face, and neck (T20). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ019
Burn and corrosion, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Burns

A burn is damage to your body's tissues caused by heat, chemicals, electricity, sunlight, or radiation. Scalds from hot liquids and steam, building fires and flammable liquids and gases are the most common causes of burns. Another kind is an inhalation injury, caused by breathing smoke.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T20.72XA to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
941.33 3rd deg burn lip
Approximate The match is approximate rather than exact.
ICD-9-CM
941.43 Deep 3rd deg burn lip
Approximate The match is approximate rather than exact.
ICD-9-CM
941.53 3rd deg burn w loss-lip
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T20.72XAOverview

Is T20.72XA (Corrosion of third degree of lip(s)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report corrosion of third degree of lip(s), initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T20.72XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for corrosion of third degree of lip(s), such as an emergency visit or first evaluation.

What MS-DRG does T20.72XA group to?

When corrosion of third degree of lip(s), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 928, 929, with relative weights from 3.2208 to 7.1727 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T20.72XA?

Under the General Equivalence Mappings, corrosion of third degree of lip(s), initial encounter converts to ICD-9-CM 941.33 (3rd deg burn lip), 941.43 (deep 3rd deg burn lip), and 941.53 (3rd deg burn w loss-lip). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.