2027 ICD-10-CM Diagnosis Code S13.5XXASprain of thyroid region, initial encounter

ICD-10-CM Codes›S00–T88›S10-S19›S13

ICD-10-CM S13.5XXA
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S13.5XXA is a billable ICD-10-CM diagnosis code for sprain of thyroid region, 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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 564 through 566, 963 through 965. Coders also document this condition as complete tear, thyroid region ligament. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, initial encounter.

Code Identity

ICD-10-CM Code
S13.5XXA
Billable Status
Yes — Valid for Submission
Code Describes
Sprain of thyroid region, initial encounter
Short Description
Sprain of thyroid region, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S13.5
Sprain of thyroid region

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS10-S19Injuries to the neck
CategoryS13Dislocation and sprain of joints and ligaments at neck level
This CodeS13.5XXASprain of thyroid region, initial encounter

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 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 S13.5XXA: its own notes plus those printed at S13, block S10-S19, 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 S13 Dislocation and sprain of joints and ligaments at neck level applies to 75 codes
  • avulsion of joint or ligament at neck level
  • laceration of cartilage, joint or ligament at neck level
  • sprain of cartilage, joint or ligament at neck level
  • traumatic hemarthrosis of joint or ligament at neck level
  • traumatic rupture of joint or ligament at neck level
  • traumatic subluxation of joint or ligament at neck level
  • traumatic tear of joint or ligament at neck level
From Block S10-S19 Injuries to the neck applies to 1,074 codes
  • injuries of nape
  • injuries of supraclavicular region
  • injuries of throat

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 S13 Dislocation and sprain of joints and ligaments at neck level applies to 75 codes
  • strain of muscle or tendon at neck level (S16.1)
From Block S10-S19 Injuries to the neck applies to 1,074 codes
  • burns and corrosions (T20-T32)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in larynx (T17.3)
  • effects of foreign body in pharynx (T17.2)
  • effects of foreign body in trachea (T17.4)
  • 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 S13 Dislocation and sprain of joints and ligaments at neck level applies to 75 codes
  • any associated open wound

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 S13 Dislocation and sprain of joints and ligaments at neck level applies to 75 codes
  • The appropriate 7th character is to be added to each code from category S13
Values for category S13 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ024
Sprains and strains, 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 S13.5XXA to ICD-9-CMHistory

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

ICD-9-CM
848.2 Sprain of thyroid region
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 S13.5XXAOverview

What is the ICD-10 code for sprain of thyroid region, initial encounter?

The ICD-10-CM code for sprain of thyroid region, initial encounter is S13.5XXA (sometimes written as S135XXA). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is S13.5XXA (Sprain of thyroid region) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report sprain of thyroid region, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in S13.5XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for sprain of thyroid region, such as an emergency visit or first evaluation.

What MS-DRG does S13.5XXA group to?

When sprain of thyroid region, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 964, 965, 566, 565, 963, with relative weights from 0.7374 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S13.5XXA?

Under the General Equivalence Mappings, sprain of thyroid region, initial encounter converts to ICD-9-CM 848.2 (sprain of thyroid region). The mapping is approximate, so confirm the match fits the documentation.