ICD-10-CM 2027 diagnosis code
A75.3Typhus fever due to Rickettsia tsutsugamushi
A75.3 is a valid, billable ICD-10-CM code for typhus fever due to rickettsia tsutsugamushi. 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 Tsutsugamushi.
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 A75.3
A75.3 is the ICD-10-CM diagnosis code for typhus fever due to Rickettsia tsutsugamushi. It belongs to category A75 (typhus fever), block A75-A79 (rickettsioses) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within A75 (typhus fever), A75.3 is specifically for typhus fever due to Rickettsia tsutsugamushi. Related codes cover epidemic louse-borne typhus fever due to Rickettsia prowazekii (A75.0), Recrudescent typhus [Brill's disease] (A75.1), due to Rickettsia typhi (A75.2) and unspecified (A75.9).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), 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 081.2 (Scrub typhus).
Coding notes
- Scrub (mite-borne) typhus
- Tsutsugamushi fever
- Typhus fever due to Orientia Tsutsugamushi (scrub typhus)
Notes that apply from higher levels
Instructions written at a parent level also apply to A75.3.
› From A75 Typhus fever
- rickettsiosis due to Ehrlichia sennetsu (A79.81)
Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.
Alphabetic index entries
19 entriesTerms in the official ICD-10-CM index that lead to A75.3.
- Disease, diseased › akamushi (scrub typhus)
- Disease, diseased › island (scrub typhus)
- Disease, diseased › Kedani (scrub typhus)
- Disease, diseased › shimamushi (scrub typhus)
- Disease, diseased › tsutsugamushi
- Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Japanese river
- Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › kedani
- Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Sumatran mite
- Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › tsutsugamushi
- Infection, infected, infective (opportunistic) › typhus › mite-borne
- Japanese › river fever
- Kedani fever
- Sumatran mite fever
- Tsutsugamushi (disease) (fever)
- Typhus (fever) › due to Rickettsia › tsutsugamushi
- Typhus (fever) › mite-borne
- Typhus (fever) › Orientia Tsutsugamushi (scrub typhus)
- Typhus (fever) › scrub (China) (India) (Malaysia) (New Guinea)
- Typhus (fever) › tropical (mite-borne)
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 18 · Infectious and Parasitic Diseases, Systemic or Unspecified Sites
ICD-9-CM equivalent
Converter →- 081.2Scrub typhusexact
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 A75.3
Is A75.3 billable?
- Yes. A75.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A75.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A75.3 as a principal diagnosis.
Is A75.3 a CC or MCC?
- A75.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does A75.3 group to?
- A75.3 is used in the MS-DRG v44.0 logic for MS-DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC), MS-DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC) and MS-DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/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 A75.3?
- The CMS General Equivalence Mappings map A75.3 to ICD-9-CM 081.2.