2026 ICD-10-CM Diagnosis Code S16.1XXSStrain of muscle, fascia and tendon at neck level, sequela

ICD-10-CM Codes›S00–T88›S10-S19›S16

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

S16.1XXS is a billable ICD-10-CM diagnosis code for strain of muscle, fascia and tendon at neck level, 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 562 through 563. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
S16.1XXS
Billable Status
Yes — Valid for Submission
Code Describes
Strain of muscle, fascia and tendon at neck level, sequela
Short Description
Strain of muscle, fascia and tendon at neck level, sequela
Same as the full description in the CMS dataset.
Parent Code
S16.1
Strain 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 CodeS16.1XXSStrain of muscle, fascia and tendon at neck level, sequela

Present on Admission (POA)Billing

S16.1XXS 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.

  • Dislocations, sprains and strains involving head with neck
  • Dislocations, sprains and strains involving multiple body regions
  • Dislocations/sprains/strains
  • Injury of muscle of neck
  • Injury of tendon of neck
  • Kinematic imbalance due to suboccipital strain
  • Rupture of tendon of head and neck
  • Strain of fascia of neck
  • Strain of neck muscle
  • Strain of tendon of head and neck
  • Strain of tendon of neck

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 INJ073
Injury, sequela
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 S16.1XXS to ICD-9-CMHistory

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

ICD-9-CM
905.7 Late effec sprain/strain
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 S16.1XXSOverview

Is S16.1XXS (Strain of muscle, fascia and tendon at neck level) a billable code?

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

What does the 7th character S in S16.1XXS mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the strain of muscle, fascia and tendon at neck level itself has resolved, not the original event.

What MS-DRG does S16.1XXS group to?

When strain of muscle, fascia and tendon at neck level, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, with relative weights from 0.8955 to 1.4248 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S16.1XXS 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 strain of muscle, fascia and tendon at neck level, sequela on inpatient claims.

What is the ICD-9 equivalent of S16.1XXS?

Under the General Equivalence Mappings, strain of muscle, fascia and tendon at neck level, sequela converts to ICD-9-CM 905.7 (late effec sprain/strain). 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.