2026 ICD-10-CM Diagnosis Code R41.1Anterograde amnesia

ICD-10-CM Codes›R00–R99›R40-R46›R41

ICD-10-CM R41.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R41.1 is a billable ICD-10-CM diagnosis code for anterograde amnesia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 947 through 948. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as amnesia for recent events. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system signs and symptoms.

Code Identity

ICD-10-CM Code
R41.1
Billable Status
Yes — Valid for Submission
Code Describes
Anterograde amnesia
Short Description
Anterograde amnesia
Same as the full description in the CMS dataset.
Parent Code
R41
Other symptoms and signs involving cognitive functions and awareness

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR40-R46Symptoms and signs involving cognition, perception, emotional state and behavior
CategoryR41Other symptoms and signs involving cognitive functions and awareness
This CodeR41.1Anterograde amnesia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Amnesia for recent events
  • Anterograde amnesia
  • Cognitive perceptual pattern
  • Uncompensated short term memory deficit

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Amnesia
      • anterograde

Clinical ClassificationClinical

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

CCSR SYM010
Nervous system signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Memory

Every day, you have different experiences and you learn new things. Your brain cannot store all of that information, so it has to decide what is worth remembering. Memory is the process of storing and then remembering this information. There are different types of memory. Short-term memory stores information for a few seconds or minutes.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert R41.1 to ICD-9-CMHistory

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

ICD-9-CM
780.93 Memory loss
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R41.1Overview

Is R41.1 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report anterograde amnesia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R41.1 group to?

When anterograde amnesia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 947, 948, with relative weights from 0.8005 to 1.2694 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R41.1 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the anterograde amnesia is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R41.1?

Under the General Equivalence Mappings, anterograde amnesia converts to ICD-9-CM 780.93 (memory loss). 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.