2026 ICD-10-CM Diagnosis Code S16.8XXAOther specified injury of muscle, fascia and tendon at neck level, initial encounter

ICD-10-CM Codes›S00–T88›S10-S19›S16

ICD-10-CM S16.8XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S16.8XXA is a billable ICD-10-CM diagnosis code for other specified injury of muscle, fascia and tendon at neck level, 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 913 through 914, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury to nerves, muscles and tendons, initial encounter.

Code Identity

ICD-10-CM Code
S16.8XXA
Billable Status
Yes — Valid for Submission
Code Describes
Other specified injury of muscle, fascia and tendon at neck level, initial encounter
Short Description
Inj muscle, fascia and tendon at neck level, init encntr
Parent Code
S16.8
Other specified injury of muscle, fascia and tendon at neck level

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS10-S19Injuries to the neck
CategoryS16Injury of muscle, fascia and tendon at neck level
This CodeS16.8XXAOther specified injury of muscle, fascia and tendon at neck level, initial encounter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of muscle, fascia and tendon at neck level (S16). 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 INJ025
Injury to nerves, muscles and tendons, 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 S16.8XXA to ICD-9-CMHistory

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

ICD-9-CM
959.09 Face & neck injury
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 S16.8XXAOverview

Is S16.8XXA a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified injury of muscle, fascia and tendon at neck level, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S16.8XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other specified injury of muscle, fascia and tendon at neck level, such as an emergency visit or first evaluation.

What MS-DRG does S16.8XXA group to?

When other specified injury of muscle, fascia and tendon at neck level, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 913, 914, 963, 964, 965, with relative weights from 0.8855 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S16.8XXA?

Under the General Equivalence Mappings, other specified injury of muscle, fascia and tendon at neck level, initial encounter converts to ICD-9-CM 959.09 (face & neck injury). 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.