2026 ICD-10-CM Diagnosis Code S09.90XDUnspecified injury of head, subsequent encounter
S09.90XD is a billable ICD-10-CM diagnosis code for unspecified injury of head, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other unspecified injuries, subsequent encounter.
Code Identity
Code Classification
Present on Admission (POA)Billing
S09.90XD 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.
- Bleeding from nose
- Chorea due to and following injury of head
- Chorea due to injury of head
- Chorea following injury
- Closed injury of head
- Closed wound of head
- Cranial cerebrospinal fluid leak
- Dystonia due to head injury
- Friction alopecia
- Head and neck injury
- Headache due to injury of head and neck
- Hemichorea
- Hemichorea due to head injury
- Injury of back of head
- Injury of forehead
- Injury of head
- Injury of head and/or neck
- Injury of head with otorrhagia
- Injury of head with rhinorrhagia
- Injury of upper respiratory tract
- Language disorder associated with thought disorder
- Leak of cranial cerebrospinal fluid due to and following injury of head
- Major head injury
- Metal foreign body in forehead
- Minor head injury
- Moderate head injury
- Multiple injuries of bone of cranium
- Multiple injuries of head
- Multiple injuries of head and chest
- Multiple injuries of thorax
- Non-accidental injury
- Non-accidental injury to child
- Non-accidental traumatic head injury to child
- Parkinsonism due to and following injury of head
- Posttraumatic headache
- Post-traumatic mutism
- Scalp injury
- Traumatic alopecia
- Traumatic epistaxis
- Vertigo preceded by head injury
- Wig friction
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 S09.90XD to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S09.90XDOverview
Is S09.90XD (Unspecified injury of head) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of head, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character D in S09.90XD mean?
The final character D marks a subsequent encounter: use it for routine care while the unspecified injury of head is healing, after active treatment has ended.
What MS-DRG does S09.90XD group to?
When unspecified injury of head, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S09.90XD 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 unspecified injury of head, subsequent encounter on inpatient claims.
What is the ICD-9 equivalent of S09.90XD?
Under the General Equivalence Mappings, unspecified injury of head, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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.
