2027 ICD-10-CM Diagnosis Code G93.1Anoxic brain damage, not elsewhere classified
ICD-10-CM Codes›G00–G99›G89-G99›G93
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 202
- Chronic Condition
G93.1 is a billable ICD-10-CM diagnosis code for anoxic brain damage, not elsewhere classified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93, 791, 793. 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 71 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Coma; stupor; and brain damage.
For Medicare Advantage risk adjustment, G93.1 maps to CMS-HCC Category 202 (Coma, Brain Compression/Anoxic Damage) under the V28 model, adding a risk factor of about 0.543 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G93.1 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute anoxic encephalopathy
- Anoxia of brain
- Anoxic brain damage complication
- Anoxic brain damage during AND/OR resulting from a procedure
- Anoxic encephalopathy
- Anoxic encephalopathy due to asphyxiation
- Anoxic encephalopathy due to cardiac arrest
- Anoxic encephalopathy due to respiratory arrest
- Anoxic-ischemic encephalopathy
- Brain disorder resulting from a period of impaired oxygen delivery to the brain
- Cerebral anoxia complication
- Cerebral anoxia following anesthesia AND/OR sedation in labor AND/OR delivery
- Cerebral anoxia following ectopic pregnancy
- Cerebral anoxia following molar pregnancy
- Cerebral anoxia following obstetric procedure
- Chorea due to cerebral anoxia
- Chronic anoxic encephalopathy
- Chronic hypoxic-ischemic brain injury
- Delayed post-hypoxic leukoencephalopathy
- Dementia associated with cerebral anoxia
- Dystonia due to cerebral anoxia
- Epilepsy due to perinatal anoxic-ischemic brain injury
- Failed attempted termination of pregnancy with cerebral anoxia
- Hypoxia of brain
- Hypoxic-ischemic coma
- Miscarriage with cerebral anoxia
- Obstetrical central nervous system complication of anesthesia AND/OR sedation
- Obstetrical complication of anesthesia AND/OR sedation
- Oxygen supply absent
- Post-anoxic myoclonus
- Post-asphyxial encephalopathy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G93.1: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.
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.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G93.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G93.1Overview
What is the ICD-10 code for anoxic brain damage, not elsewhere classified?
The ICD-10-CM code for anoxic brain damage, not elsewhere classified is G93.1 (sometimes written as G931). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G93.1 (Other disorders of brain) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anoxic brain damage, not elsewhere classified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G93.1 group to?
When anoxic brain damage, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 91, 92, 93, with relative weights from 0.7783 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is G93.1 a CC or MCC?
CMS lists G93.1 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 71 closely related codes in its exclusion list.
Can G93.1 be reported with O74.3?
Not as a rule. The Excludes1 note on G93.1 lists "cerebral anoxia due to anesthesia during labor and delivery (O74.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is G93.1?
G93.1 (anoxic brain damage, not elsewhere classified) maps to CMS-HCC Category 202 (Coma, Brain Compression/Anoxic Damage), commonly written as HCC 202, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 80 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does G93.1 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, G93.1 adds a risk adjustment factor of about 0.543 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.097 to 0.721 depending on the payment segment). A more severe related category (HCC 63, HCC 397, and HCC 398) supersedes it when both are reported. See the full factor table on the HCC 202 category page.
