2026 ICD-10-CM Diagnosis Code S46.319SStrain of muscle, fascia and tendon of triceps, unspecified arm, sequela
S46.319S is a billable ICD-10-CM diagnosis code for strain of muscle, fascia and tendon of triceps, unspecified 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 562 through 563. The code is exempt from POA reporting. Coders also document this condition as injury of triceps brachii muscle. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S46.319S 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.
- Injury of triceps brachii muscle
- Strain of fascia of triceps brachii
- Strain of muscle of upper arm
- Strain of tendon of triceps brachii
- Strain of triceps brachii muscle
- Strain of triceps brachii muscle and/or tendon
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of muscle, fascia and tendon at shoulder and upper arm level (S46). 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
Arm Injuries and Disorders
Of the 206 bones in your body, three of them are in your arm: the humerus, radius, and ulna. Your arms are also made up of muscles, joints, tendons, and other connective tissue. Injuries to any of these parts of the arm can occur during sports, a fall, or an accident.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S46.319S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S46.319SOverview
Is S46.319S a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report strain of muscle, fascia and tendon of triceps, unspecified arm, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S46.319S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the strain of muscle, fascia and tendon of triceps, unspecified arm itself has resolved, not the original event.
What MS-DRG does S46.319S group to?
When strain of muscle, fascia and tendon of triceps, unspecified arm, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, with relative weights from 0.8955 to 1.4248 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S46.319S 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 strain of muscle, fascia and tendon of triceps, unspecified arm, sequela on inpatient claims.
What is the ICD-9 equivalent of S46.319S?
Under the General Equivalence Mappings, strain of muscle, fascia and tendon of triceps, unspecified arm, sequela converts to ICD-9-CM 905.7 (late effec sprain/strain). 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.
