2027 ICD-10-CM Diagnosis Code S37.818AOther injury of adrenal gland, initial encounter
ICD-10-CM Codes›S00–T88›S30-S39›S37
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- 7th Character A — Initial Encounter
- Not Chronic
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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 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 164 closely related codes. 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
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 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 S37.818A: its own notes plus those printed at S37, block S30-S39, 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.
- injuries to the abdominal wall
- injuries to the anus
- injuries to the buttock
- injuries to the external genitalia
- injuries to the flank
- injuries to the groin
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- 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.
Notes
General instructions on how these codes are used.
- 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.
- The appropriate 7th character is to be added to each code from category S37
- Ainitial encounter this code
- Dsubsequent encounter
- Ssequela
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name S37.818A, its category, or a range that includes it.
Use Additional Code 1
These codes say to use an additional code from the note, and S37.818A is one of the codes named.
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
What is the ICD-10 code for other injury of adrenal gland, initial encounter?
The ICD-10-CM code for other injury of adrenal gland, initial encounter is S37.818A (sometimes written as S37818A). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 964, 965, 644, 645, 643, 963, with relative weights from 0.7461 to 2.6361 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S37.818A a CC or MCC?
CMS lists S37.818A as a CC (complication or comorbidity) for FY 2027. 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 164 closely related codes in its exclusion list.
