2026 ICD-10-CM Diagnosis Code S40.819SAbrasion of unspecified upper arm, sequela
S40.819S is a billable ICD-10-CM diagnosis code for abrasion of unspecified upper arm, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S40.819S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abrasion and/or friction burn of axilla with infection
- Abrasion and/or friction burn of axilla without infection
- Abrasion and/or friction burn of shoulder and/or upper arm, infected
- Abrasion and/or friction burn of upper arm with infection
- Abrasion and/or friction burn of upper arm without infection
- Abrasion and/or friction burn of upper limb without infection
- Abrasion of skin of axilla
- Abrasion of skin of upper arm
- Infected abrasion of skin of axilla
- Infected abrasion of skin of upper arm
- Scratch of axilla
- Scratch of upper arm
- Superficial injury of axilla with infection
- Superficial injury of axilla without infection
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Superficial injury of shoulder and upper arm (S40). 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.
Patient EducationClinical
Wounds and Injuries
An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S40.819S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S40.819SOverview
Is S40.819S (Abrasion of unspecified upper arm) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report abrasion of unspecified upper arm, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S40.819S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the abrasion of unspecified upper arm itself has resolved, not the original event.
What MS-DRG does S40.819S group to?
When abrasion of unspecified upper arm, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S40.819S exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for abrasion of unspecified upper arm, sequela on inpatient claims.
What is the ICD-9 equivalent of S40.819S?
Under the General Equivalence Mappings, abrasion of unspecified upper arm, sequela converts to ICD-9-CM 906.2 (late eff superficial inj). 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.
