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ICD-10-CM 2027 diagnosis code

R41.1Anterograde amnesia

✓ Billable / specific

R41.1 is a valid, billable ICD-10-CM code for anterograde amnesia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R41.1

R41.1 is the ICD-10-CM diagnosis code for Anterograde amnesia. It belongs to category R41 (other symptoms and signs involving cognitive functions and awareness), block R40-R46 (symptoms and signs involving cognition, perception, emotional state and behavior) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R41 (other symptoms and signs involving cognitive functions and awareness), R41.1 is specifically for Anterograde amnesia. Related codes cover Disorientation, unspecified (R41.0), retrograde amnesia (R41.2), other amnesia (R41.3), neurologic neglect syndrome (R41.4), other symptoms and signs involving cognitive functions and awareness (R41.8) and unspecified symptoms and signs involving cognitive functions and awareness (R41.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 780.93 (Memory loss).

Notes that apply from higher levels

Instructions written at a parent level also apply to R41.1.

› From R41 Other symptoms and signs involving cognitive functions and awareness
Excludes1
  • dissociative [conversion] disorders (F44.-)
  • mild cognitive impairment of uncertain or unknown etiology (G31.84)

Broader instructions also apply from R40-R46 Symptoms and signs involving cognition, perception, emotional state and behavior and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to R41.1.

Codes whose notes reference R41.1

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services

ICD-9-CM equivalent

Converter →

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R41.1

Is R41.1 billable?

Yes. R41.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R41.1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R41.1 as a principal diagnosis.

Is R41.1 a CC or MCC?

No. R41.1 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R41.1 group to?

R41.1 is used in the MS-DRG v44.0 logic for MS-DRG 947 (Signs and Symptoms with MCC) and MS-DRG 948 (Signs and Symptoms without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R41.1?

The CMS General Equivalence Mappings map R41.1 to ICD-9-CM 780.93.