2026 ICD-10-CM Diagnosis Code S11.10XAUnspecified open wound of thyroid gland, initial encounter
ICD-10-CM Codes›S00–T88›S10-S19›S11
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- 7th Character A — Initial Encounter
- Not Chronic
S11.10XA is a billable ICD-10-CM diagnosis code for unspecified open wound of thyroid gland, 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 11 through 13, 643 through 645, 963 through 965. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 30 closely related codes. Coders also document this condition as open wound of thyroid. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Open wounds of head and neck, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Open wound of thyroid
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.
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 S11.10XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S11.10XAOverview
What is the ICD-10 code for unspecified open wound of thyroid gland, initial encounter?
The ICD-10-CM code for unspecified open wound of thyroid gland, initial encounter is S11.10XA (sometimes written as S1110XA). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S11.10XA (Unspecified open wound of thyroid gland) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of thyroid gland, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S11.10XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified open wound of thyroid gland, such as an emergency visit or first evaluation.
What MS-DRG does S11.10XA group to?
When unspecified open wound of thyroid gland, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 643, 644, 645, 963, 964, 965, with relative weights from 0.7683 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S11.10XA a CC or MCC?
CMS lists S11.10XA as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 30 closely related codes in its exclusion list.
