2027 ICD-10-CM Diagnosis Code S09.90XSUnspecified injury of head, sequela
S09.90XS is a billable ICD-10-CM diagnosis code for unspecified injury 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 913 through 914. 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
S09.90XS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the head (S00-S09).
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
- Dementia due to and following injury of head
- Dystonia due to head injury
- Foreign body of forehead
- Friction alopecia
- Friction dermatosis
- 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
- Sequelae of injuries of head
- 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 2027, published by CMS and the National Center for Health Statistics.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to S09.90XS: its own notes plus those printed at S09.90, S09, block S00-S09, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- injuries of ear
- injuries of eye
- injuries of face [any part]
- injuries of gum
- injuries of jaw
- injuries of oral cavity
- injuries of palate
- injuries of periocular area
- injuries of scalp
- injuries of temporomandibular joint area
- injuries of tongue
- injuries of tooth
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- burns and corrosions (T20-T32)
- effects of foreign body in ear (T16)
- effects of foreign body in larynx (T17.3)
- effects of foreign body in mouth NOS (T18.0)
- effects of foreign body in nose (T17.0-T17.1)
- effects of foreign body in pharynx (T17.2)
- effects of foreign body on external eye (T15.-)
- frostbite (T33-T34)
- insect bite or sting, venomous (T63.4)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any retained foreign body, if applicable (Z18.-)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
- for any associated infection
Notes
General instructions on how these codes are used.
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- The appropriate 7th character is to be added to each code from category S09
- Ainitial encounter
- Dsubsequent encounter
- Ssequela this code
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name S09.90XS, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming S09.90XS: they are not reported together with it, unless the two conditions are unrelated.
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 S09.90XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S09.90XSOverview
What is the ICD-10 code for unspecified injury of head, sequela?
The ICD-10-CM code for unspecified injury of head, sequela is S09.90XS (sometimes written as S0990XS). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is S09.90XS (Unspecified injury of head) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of head, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character S in S09.90XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified injury of head itself has resolved, not the original event.
What MS-DRG does S09.90XS group to?
When unspecified injury of head, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 914, 913, with relative weights from 0.9281 to 1.5448 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S09.90XS 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, sequela on inpatient claims. The code appears in the Injuries to the head (S00-S09) range of the CMS exempt list.
