2026 ICD-10-CM Diagnosis Code S37.818AOther injury of adrenal gland, initial encounter
S37.818A is a billable ICD-10-CM diagnosis code for other injury of adrenal 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 643 through 645, 963 through 965. Coders also document this condition as fragmentation of adrenal gland. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Fragmentation of adrenal gland
- Injury of adrenal gland
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of urinary and pelvic organs (S37). 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
Adrenal Gland Disorders
Your adrenal glands are two small organs that sit on top of each kidney. The adrenal glands make different types of hormones you need to stay alive and healthy. Hormones are chemicals that travel in your bloodstream and control how different parts of your body work.
The full article covers:
- What are adrenal glands?
- What are adrenal gland disorders?
- What causes adrenal gland disorders?
- How are adrenal gland disorders diagnosed?
- What are the treatments for adrenal gland disorders?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S37.818A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S37.818AOverview
Is S37.818A (Other injury of adrenal gland) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other injury of adrenal gland, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S37.818A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for other injury of adrenal gland, such as an emergency visit or first evaluation.
What MS-DRG does S37.818A group to?
When other injury of adrenal gland, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 643, 644, 645, 963, 964, 965, with relative weights from 0.7683 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S37.818A?
Under the General Equivalence Mappings, other injury of adrenal gland, initial encounter converts to ICD-9-CM 868.01 (adrenal gland injury-cl). 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.
