2026 ICD-10-CM Diagnosis Code S01.90XSUnspecified open wound of unspecified part of head, sequela

ICD-10-CM Codes›S00–T88›S00-S09›S01

ICD-10-CM S01.90XS
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S01.90XS is a billable ICD-10-CM diagnosis code for unspecified open wound of unspecified part 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 604 through 605. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Injury, sequela.

Code Identity

ICD-10-CM Code
S01.90XS
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of unspecified part of head, sequela
Short Description
Unspecified open wound of unspecified part of head, sequela
Same as the full description in the CMS dataset.
Parent Code
S01.90
Unspecified open wound of unspecified part of head

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS01Open wound of head
This CodeS01.90XSUnspecified open wound of unspecified part of head, sequela

Present on Admission (POA)Billing

S01.90XS 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.

  • Brain injury with open intracranial wound AND concussion
  • Brain injury with open intracranial wound AND loss of consciousness
  • Brain stem contusion
  • Brain stem contusion with open intracranial wound
  • Brain stem contusion with open intracranial wound AND concussion
  • Brain stem contusion with open intracranial wound AND loss of consciousness
  • Brain stem laceration
  • Brain stem laceration with concussion
  • Brain stem laceration with loss of consciousness
  • Brain stem laceration with open intracranial wound
  • Brain stem laceration with open intracranial wound AND concussion
  • Brain stem laceration with open intracranial wound AND loss of consciousness
  • Brain stem laceration with open intracranial wound AND no loss of consciousness
  • Cerebellar contusion
  • Cerebellar contusion with open intracranial wound
  • Cerebellar contusion with open intracranial wound AND concussion
  • Cerebellar contusion with open intracranial wound AND loss of consciousness
  • Cerebellar laceration
  • Cerebellar laceration with concussion
  • Cerebellar laceration with open intracranial wound
  • Cerebellar laceration with open intracranial wound AND concussion
  • Cerebellar laceration with open intracranial wound AND loss of consciousness
  • Cerebellar laceration with open intracranial wound AND no loss of consciousness
  • Cerebral cortex laceration with concussion
  • Complete open fracture of maxilla
  • Complex wound of head
  • Complex wound of head with avulsive loss of part of skull and cranial contents
  • Complex wound of head with retained external material
  • Contusion and laceration of cerebrum
  • Contusion of brain with open intracranial wound
  • Contusion of cerebral cortex
  • Contusion of cerebrum with open intracranial wound
  • Contusion of hindbrain
  • Contusion of hindbrain with open intracranial wound
  • Cortex contusion with open intracranial wound
  • Cortex contusion with open intracranial wound AND concussion
  • Cortex contusion with open intracranial wound AND loss of consciousness
  • Cortex contusion with open intracranial wound, with no loss of consciousness
  • Cortex laceration
  • Cortex laceration with open intracranial wound
  • Cortex laceration with open intracranial wound AND concussion
  • Cortex laceration with open intracranial wound AND loss of consciousness
  • Cortex laceration with open intracranial wound, with no loss of consciousness
  • Extradural hemorrhage following injury with open intracranial wound
  • Extradural hemorrhage following injury with open intracranial wound AND concussion
  • Extradural hemorrhage following injury with open intracranial wound AND loss of consciousness
  • Extradural intracranial hematoma
  • Foreign body left in wound
  • Fracture of alveolus, open
  • Fracture of malar or maxillary bones, open
  • Glass in head
  • Glass in head and neck
  • Glass in neck
  • Gunshot wound of head
  • Hind brain laceration with open intracranial wound
  • Hind brain laceration with open intracranial wound and loss of consciousness
  • Hind brain laceration with open intracranial wound, with no loss of consciousness
  • Injury of Eustachian tube
  • Intracranial hematoma following injury
  • Intracranial hemorrhage following injury with loss of consciousness
  • Intracranial hemorrhage following injury with open intracranial wound
  • Intracranial hemorrhage following injury with open intracranial wound AND concussion
  • Intracranial hemorrhage following injury with open intracranial wound AND loss of consciousness
  • Intracranial injury with prolonged coma
  • Intracranial injury with prolonged coma with open wound
  • Intracranial subdural hemorrhage with open intracranial wound
  • Laceration of brain with open intracranial wound
  • Late effect of open wound of head, neck and trunk
  • Le Fort's fracture
  • Le Fort's fracture, type I
  • Le Fort's fracture, type II
  • Le Fort's fracture, type III
  • Metal foreign body in head and neck
  • Metal foreign body in neck
  • Multiple fractures of skull
  • Multiple open fractures of skull
  • Multiple open wounds of head
  • Open fracture of alveolar ridge of maxilla
  • Open fracture of base of skull
  • Open fracture of base of skull with contusion and laceration of cerebrum
  • Open fracture of base of skull with intracranial hemorrhage
  • Open fracture of base of skull with intracranial injury
  • Open fracture of base of skull with intracranial injury, with no loss of consciousness
  • Open fracture of maxilla
  • Open fracture of orbit
  • Open fracture of skull
  • Open fracture of skull with contusion of cerebrum
  • Open fracture of skull with laceration of cerebrum
  • Open fracture of tooth
  • Open fracture of vault of skull
  • Open fracture of vault of skull with concussion
  • Open fracture of vault of skull with contusion of cerebrum
  • Open fracture of vault of skull with intracranial injury, with no loss of consciousness
  • Open fracture of vault of skull with loss of consciousness
  • Open fracture vault of skull with intracranial injury
  • Open horizontal fracture of maxilla
  • Open injury with foreign body in wound
  • Open pyramidal fracture of maxilla
  • Open skull fracture with intracranial hemorrhage
  • Open skull fracture with intracranial injury
  • Open wound of eustachian tube
  • Open wound of head
  • Open wound of head AND/OR neck
  • Open wound of head, neck and trunk
  • Open wounds involving head with neck
  • Sequelae of open wound of head
  • Subarachnoid hemorrhage due to traumatic injury
  • Subarachnoid hemorrhage following injury with open intracranial wound
  • Subarachnoid hemorrhage following injury with open intracranial wound AND concussion
  • Subarachnoid hemorrhage following injury with open intracranial wound AND loss of consciousness
  • Traumatic brain injury with no loss of consciousness
  • Traumatic extradural hematoma
  • Traumatic extradural hematoma with open intracranial wound
  • Traumatic hematoma of subdural space of neuraxis
  • Traumatic intracranial extradural hematoma
  • Traumatic intracranial subdural hematoma
  • Traumatic intracranial subdural hematoma with open intracranial wound
  • Traumatic intracranial subdural hemorrhage following open wound of head
  • Traumatic subdural intracranial hemorrhage

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of head (S01). 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.

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

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 S01.90XS to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
906.0 Lt eff opn wnd head/trnk
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S01.90XSOverview

Is S01.90XS (Unspecified open wound of unspecified part of head) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of unspecified part of head, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S01.90XS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified open wound of unspecified part of head itself has resolved, not the original event.

What MS-DRG does S01.90XS group to?

When unspecified open wound of unspecified part of head, 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 S01.90XS 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 open wound of unspecified part of head, sequela on inpatient claims.

What is the ICD-9 equivalent of S01.90XS?

Under the General Equivalence Mappings, unspecified open wound of unspecified part of head, sequela converts to ICD-9-CM 906.0 (lt eff opn wnd head/trnk). 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.