2026 ICD-10-CM Diagnosis Code S09.11XSStrain of muscle and tendon of head, sequela
S09.11XS is a billable ICD-10-CM diagnosis code for strain of muscle and tendon of head, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S09.11XS 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.
- Dislocations, sprains and strains involving head with neck
- Dislocations, sprains and strains involving multiple body regions
- Dislocations/sprains/strains
- Injury of muscle of head
- Injury of tendon of head
- Mentalis strain
- Rupture of tendon of head and neck
- Strain of fascia of head
- Strain of jaw
- Strain of muscle of face
- Strain of muscle of head
- Strain of tendon of head
- Strain of tendon of head and neck
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Other and unspecified injuries of head (S09). 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
Head Injuries
Chances are you've bumped your head before. Often, the injury is minor because your skull is hard and it protects your brain. But other head injuries can be more severe, such as a skull fracture, concussion, or traumatic brain injury.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S09.11XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S09.11XSOverview
Is S09.11XS (Strain of muscle and tendon of head) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report strain of muscle and tendon of head, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S09.11XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the strain of muscle and tendon of head itself has resolved, not the original event.
What MS-DRG does S09.11XS group to?
When strain of muscle and tendon of head, 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 S09.11XS 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 and tendon of head, sequela on inpatient claims.
What is the ICD-9 equivalent of S09.11XS?
Under the General Equivalence Mappings, strain of muscle and tendon of head, 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.
