2027 ICD-10-CM Diagnosis Code A93.2Colorado tick fever

ICD-10-CM Codes›A00–B99›A90-A99›A93

ICD-10-CM A93.2
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A93.2 is a billable ICD-10-CM diagnosis code for Colorado tick fever. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 865 through 866. 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 23 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Viral infection.

Code Identity

ICD-10-CM Code
A93.2
Billable Status
Yes — Valid for Submission
Code Describes
Colorado tick fever
Short Description
Colorado tick fever
Same as the full description in the CMS dataset.
Parent Code
A93
Other arthropod-borne viral fevers, not elsewhere classified

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA90-A99Arthropod-borne viral fevers and viral hemorrhagic fevers
CategoryA93Other arthropod-borne viral fevers, not elsewhere classified
This CodeA93.2Colorado tick fever

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Colorado tick fever
  • Infection caused by Coltavirus

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A93.2: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

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.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

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.

CCSR INF008
Viral infection
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Colorado Tick Fever

    a febrile illness characterized by chills, aches, vomiting, leukopenia, and sometimes encephalitis. it is caused by the colorado tick fever virus, a reovirus transmitted by the tick dermacentor andersoni.

Patient EducationClinical

Tick Bites

Ticks are small parasites. They may look like insects, but they have eight legs and are related to spiders. Ticks feed on the blood of people and warm-blooded animals. There are many types of ticks in the United States, and they live in different parts of the country.

The full article covers:

  • What are ticks?
  • Why do I need to be worried about tick bites?
  • What happens if I get bitten by a tick?
  • How do I remove a tick?
  • When do I need to contact my health care provider about a tick bite?
  • How can I prevent tick bites?

Read the full article at MedlinePlus

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

Convert A93.2 to ICD-9-CMHistory

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

ICD-9-CM
066.1 Tick-borne fever
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A93.2Overview

What is the ICD-10 code for Colorado tick fever?

The ICD-10-CM code for Colorado tick fever is A93.2 (sometimes written as A932). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A93.2 (Other arthropod-borne viral fevers, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Colorado tick fever on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A93.2 group to?

When Colorado tick fever is the principal diagnosis on an inpatient stay, it groups to MS-DRG 866, 865, with relative weights from 0.8691 to 1.3153 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A93.2 a CC or MCC?

CMS lists A93.2 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 23 closely related codes in its exclusion list.

What is the ICD-9 equivalent of A93.2?

Under the General Equivalence Mappings, Colorado tick fever converts to ICD-9-CM 066.1 (tick-borne fever). The mapping is approximate, so confirm the match fits the documentation.