2026 ICD-10-CM Diagnosis Code S13.5XXSSprain of thyroid region, sequela
S13.5XXS is a billable ICD-10-CM diagnosis code for sprain of thyroid region, 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. Coders also document this condition as complete tear, thyroid region ligament. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S13.5XXS 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.
- Complete tear, thyroid region ligament
- Neck sprain
- Sprain of ligament of cricoarytenoid joint
- Sprain of ligament of cricothyroid joint
- Sprain of thyroid cartilage
- Thyroid region sprain
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments at neck level (S13). 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.
Clinical InformationClinical
Neck Sprain
stretching or tearing of ligaments in the neck.
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.
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Convert S13.5XXS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S13.5XXSOverview
Is S13.5XXS (Sprain of thyroid region) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report sprain of thyroid region, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S13.5XXS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the sprain of thyroid region itself has resolved, not the original event.
What MS-DRG does S13.5XXS group to?
When sprain of thyroid region, 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 S13.5XXS 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 sprain of thyroid region, sequela on inpatient claims.
What is the ICD-9 equivalent of S13.5XXS?
Under the General Equivalence Mappings, sprain of thyroid region, 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.
