2027 ICD-10-CM Diagnosis Code S01.90XDUnspecified open wound of unspecified part of head, subsequent encounter

ICD-10-CM Codes›S00–T88›S00-S09›S01

ICD-10-CM S01.90XD
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S01.90XD is a billable ICD-10-CM diagnosis code for unspecified open wound of unspecified part 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 2027 (October 1, 2026 through September 30, 2027) 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 Any dental condition including traumatic injury; and Open wounds of head and neck, subsequent encounter.

Code Identity

ICD-10-CM Code
S01.90XD
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of unspecified part of head, subsequent encounter
Short Description
Unsp open wound of unspecified part of head, subs encntr
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 CodeS01.90XDUnspecified open wound of unspecified part of head, subsequent encounter

Present on Admission (POA)Billing

S01.90XD 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.

  • 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
  • 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
  • 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 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
  • Diffuse brain injury
  • Diffuse brain injury with open intracranial wound
  • 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
  • Focal brain injury with open intracranial wound
  • 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
  • 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
  • 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
  • Structural abnormality of hindbrain
  • 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 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 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 S01.90XD: its own notes plus those printed at S01, 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.

From Block S00-S09 Injuries to the head applies to 1,934 codes
  • 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.

From S01 Open wound of head applies to 270 codes
  • open skull fracture (S02.- with 7th character B)

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.

From S01 Open wound of head applies to 270 codes
  • injury of eye and orbit (S05.-)
  • traumatic amputation of part of head (S08.-)
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • 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)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

From S01 Open wound of head applies to 270 codes
  • any associated:
  • injury of cranial nerve (S04.-)
  • injury of muscle and tendon of head (S09.1-)
  • intracranial injury (S06.-)
  • wound infection
From Block S00-S09 Injuries to the head applies to 1,934 codes
  • for any associated infection

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

From S01 Open wound of head applies to 270 codes
  • The appropriate 7th character is to be added to each code from category S01
Values for category S01 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter this code
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S01.90XD, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming S01.90XD: they are not reported together with it, unless the two conditions are unrelated.

  • S00 Superficial injury of head
    open wound of head (S01.-) names S01.-, which includes this code

Code Also 3

These codes say S01.90XD may also be needed to fully describe the condition. The note gives no sequencing direction.

  • S04 Injury of cranial nerve
    open wound of head (S01.-) names S01.-, which includes this code
  • S06 Intracranial injury
    open wound of head (S01.-) names S01.-, which includes this code
  • S09.1 Injury of muscle and tendon of head
    any associated open wound (S01.-) names S01.-, which includes this code

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 INJ048
Open wounds of head and neck, subsequent encounter
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 S01.90XD to ICD-9-CMHistory

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

ICD-9-CM
V58.89 Other specfied aftercare
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S01.90XDOverview

Is S01.90XD (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, subsequent encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character D in S01.90XD mean?

The final character D marks a subsequent encounter: use it for routine care while the unspecified open wound of unspecified part of head is healing, after active treatment has ended.

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

When unspecified open wound of unspecified part of head, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 950, 949, with relative weights from 0.7661 to 1.1231 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S01.90XD 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 open wound of unspecified part of head, subsequent encounter on inpatient claims. The code appears in the Injuries to the head (S00-S09) range of the CMS exempt list.

Can S01.90XD be reported with a code from S02?

Not as a rule. The Excludes1 note at S01, which applies to S01.90XD, lists "open skull fracture (S02.- with 7th character B)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).