ICD-10-CM 2027 diagnosis code
F66Other sexual disorders
F66 is a valid, billable ICD-10-CM code for other sexual disorders. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Psychosexual development problem.
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 F66
F66 is the ICD-10-CM diagnosis code for other sexual disorders. It belongs to block F60-F69 (disorders of adult personality and behavior) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
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 887 (Other Mental Disorder Diagnoses, relative weight 1.1139), in MDC 19 (Mental Diseases and Disorders), 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 302.89 (other specified psychosexual disorders).
Coding notes
- Sexual maturation disorder
- Sexual relationship disorder
Notes that apply from higher levels
Instructions written at a parent level also apply to F66.
Broader instructions also apply from Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.
Alphabetic index entries
10 entriesTerms in the official ICD-10-CM index that lead to F66.
- Disorder (of) › gender-identity or -role › effect on relationship
- Disorder (of) › gender-identity or -role › uncertainty
- Disorder (of) › psychological › associated with › sexual › development
- Disorder (of) › psychological › associated with › sexual › relationship
- Disorder (of) › psychosexual › development
- Disorder (of) › relationship › due to sexual orientation
- Disorder (of) › sexual › maturation
- Disorder (of) › sexual › relationship
- Problem (with) (related to) › marital › involving › gender identity
- Problem (with) (related to) › psychosexual (development)
Codes whose notes reference F66
- F64.2Excludes2
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 19 · Mental Diseases and Disorders
ICD-9-CM equivalent
Converter →- 302.89Other specified psychosexual disordersapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about F66
Is F66 billable?
- Yes. F66 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F66 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F66 as a principal diagnosis.
Is F66 a CC or MCC?
- No. F66 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does F66 group to?
- F66 is used in the MS-DRG v44.0 logic for MS-DRG 887 (Other Mental Disorder Diagnoses). 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 F66?
- The CMS General Equivalence Mappings map F66 to ICD-9-CM 302.89.