2026 ICD-10-CM Diagnosis Code T22.499ACorrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, initial encounter

ICD-10-CM Codes›S00–T88›T20-T25›T22

ICD-10-CM T22.499A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T22.499A is a billable ICD-10-CM diagnosis code for corrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, 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). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Burn and corrosion, initial encounter.

Code Identity

ICD-10-CM Code
T22.499A
Billable Status
Yes — Valid for Submission
Code Describes
Corrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, initial encounter
Short Description
Corros unsp deg mult sites of shldr/up lmb, ex wrs/hnd, init
Parent Code
T22.499
Corrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT20-T25Burns and corrosions of external body surface, specified by site
CategoryT22Burn and corrosion of shoulder and upper limb, except wrist and hand
This CodeT22.499ACorrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, 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 shoulder and upper limb, except wrist and hand (T22). 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 T22.499A to ICD-9-CMHistory

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

ICD-9-CM
943.09 Burn NOS arm-multiple
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 T22.499AOverview

Is T22.499A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report corrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T22.499A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for corrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, such as an emergency visit or first evaluation.

What is the ICD-9 equivalent of T22.499A?

Under the General Equivalence Mappings, corrosion of unspecified degree of multiple sites of unspecified shoulder and upper limb, except wrist and hand, initial encounter converts to ICD-9-CM 943.09 (burn NOS arm-multiple). 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.