2026 ICD-10-CM Diagnosis Code S11.90XAUnspecified open wound of unspecified part of neck, initial encounter

ICD-10-CM S11.90XA

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

S11.90XA is a billable ICD-10-CM diagnosis code for unspecified open wound of unspecified part of neck, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. 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, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of head and neck, initial encounter.

Code Identity

ICD-10-CM Code

S11.90XA

Billable Status

Yes — Valid for Submission

Code Describes

Unspecified open wound of unspecified part of neck, initial encounter

Short Description

Unsp open wound of unspecified part of neck, init encntr

Parent Code

S11.90

Unspecified open wound of unspecified part of neck

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes

SectionS10-S19Injuries to the neck

CategoryS11Open wound of neck

This CodeS11.90XAUnspecified open wound of unspecified part of neck, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

Filter synonyms:

Anterior cord syndrome due to open fracture of C5-C7 level
Burst fracture of cervical vertebra
Central cord syndrome due to open fracture at C5-C7 level
Central cord syndrome of cervical cord due to open subluxation of cervical spine
Central cord syndrome of cervical spinal cord due to open dislocation of cervical spine
Central cord syndrome of cervical spinal cord due to traumatic injury
Central cord syndrome of cervical spinal cord. due to open fracture at C1-C4 level
Dislocation of atlanto-occipital joint
Fracture of fifth cervical vertebra
Fracture of fourth cervical vertebra
Fracture of larynx
Fracture of spinous process of cervical vertebra
Fracture of third cervical vertebra
Fracture of trachea
Fracture of transverse process of cervical vertebra
Fractured hyoid bone
Fractured laryngeal cartilage
Glass in head
Glass in head and neck
Glass in neck
Injury of brachial plexus trunk
Injury of cervical spinal cord due to open fracture of cervical spine
Injury to ligament of cervical spine
Metal foreign body in head and neck
Metal foreign body in neck
Multiple open dislocations of back
Multiple open fractures of cervical vertebrae
Multiple open wounds of neck
Open dislocation atlantoaxial joint
Open dislocation atlanto-occipital joint
Open dislocation C2/C3
Open dislocation C3/C4
Open dislocation C4/C5
Open dislocation C5/C6
Open dislocation C6/C7
Open dislocation C7/T1
Open dislocation of cervical spine
Open dislocation of fifth cervical vertebra
Open dislocation of first cervical vertebra
Open dislocation of fourth cervical vertebra
Open dislocation of multiple cervical vertebrae
Open dislocation of second cervical vertebra
Open dislocation of seventh cervical vertebra
Open dislocation of sixth cervical vertebra
Open dislocation of third cervical vertebra
Open division, cricoarytenoid ligament
Open division, cricothyroid ligament
Open division, neck ligament
Open division, thyroid cartilage ligament
Open division, thyroid region ligament
Open fracture atlas
Open fracture atlas, comminuted
Open fracture atlas, isolated arch or articular process
Open fracture cervical vertebra, burst
Open fracture cervical vertebra, posterior arch
Open fracture cervical vertebra, spinous process
Open fracture cervical vertebra, spondylolysis
Open fracture cervical vertebra, transverse process
Open fracture cervical vertebra, tricolumnar
Open fracture cervical vertebra, wedge
Open fracture larynx and trachea
Open fracture of C1-C4 level with incomplete spinal cord lesion
Open fracture of C1-C4 level with spinal cord injury
Open fracture of C5-C7 level with incomplete spinal cord lesion
Open fracture of C5-C7 level with spinal cord injury
Open fracture of cervical spine
Open fracture of fifth cervical vertebra
Open fracture of fourth cervical vertebra
Open fracture of hyoid bone
Open fracture of larynx
Open fracture of third cervical vertebra
Open fracture of thyroid cartilage
Open fracture of trachea
Open injury, brachial plexus, all roots
Open injury, brachial plexus, upper roots
Open injury, supraclavicular nerve
Open spinal dislocation with anterior cervical cord lesion
Open spinal dislocation with complete cervical cord lesion
Open spinal fracture with central cervical cord lesion, C5-7
Open spinal fracture with posterior cervical cord lesion, C5-7
Open spinal subluxation with anterior cervical cord lesion
Open spinal subluxation with complete cervical cord lesion
Open subluxation atlantoaxial joint
Open subluxation atlanto-occipital joint
Open subluxation C2/C3
Open subluxation C3/C4
Open subluxation C4/C5
Open subluxation C5/C6
Open subluxation C6/C7
Open subluxation C7/T1
Open subluxation cervical spine
Open subluxation of multiple cervical vertebrae
Open wound of head AND/OR neck
Open wound of head, neck and trunk
Open wound of neck
Open wound of throat
Open wound of trachea
Open wounds involving head with neck
Pellet wound of neck
Posterior cord syndrome due to open fracture of C5-C7 level
Posterior cord syndrome of cervical spinal cord due to open dislocation of cervical spine
Posterior cord syndrome of cervical spinal cord due to open subluxation of cervical spine
Spinal subluxation with cervical cord lesion
Spondylolysis of cervical spine
Subluxation of atlantoaxial joint
Subluxation of atlanto-occipital joint
Supraclavicular nerve injury
Three column fracture of cervical vertebra
Trauma causing partial dislocation of atlantoaxial joint
Traumatic anterior cord syndrome
Traumatic dislocation of atlantoaxial joint
Traumatic dislocation of atlanto-occipital joint
Traumatic dislocation of multiple cervical vertebra
Traumatic dislocation of seventh cervical and first thoracic vertebra
Traumatic dislocation of sixth and seventh cervical vertebra
Traumatic dislocation of third and fourth cervical vertebra
Traumatic subluxation of atlanto-occipital joint
Upper brachial plexus neuropathy
Wedge fracture of cervical vertebra
Wedge fracture of vertebra

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of neck (S11). 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 INJ011

Open wounds of head and neck, initial encounter

Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Neck Injuries and Disorders

Any part of your neck - muscles, bones, joints, tendons, ligaments, or nerves - can cause neck problems. Neck pain is very common. Pain may also come from your shoulder, jaw, head, or upper arms.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S11.90XA to ICD-9-CMHistory

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

ICD-9-CM

874.8 Open wound of neck NEC

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 S11.90XAOverview

Is S11.90XA (Unspecified open wound of unspecified part of neck) a billable code?

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

What does the 7th character A in S11.90XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified open wound of unspecified part of neck, such as an emergency visit or first evaluation.

What MS-DRG does S11.90XA group to?

When unspecified open wound of unspecified part of neck, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S11.90XA?

Under the General Equivalence Mappings, unspecified open wound of unspecified part of neck, initial encounter converts to ICD-9-CM 874.8 (open wound of neck NEC). 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.

Indicator	Meaning	CMS pays CC/MCC DRG
Y	Diagnosis was present at the time of inpatient admission	Yes
N	Diagnosis was not present at the time of admission	No
U	Documentation is insufficient to determine	No
W	Clinically undetermined	Yes
1	Unreported, exempt from POA reporting	No