2027 ICD-10-CM Diagnosis Code A69.9Spirochetal infection, unspecified

ICD-10-CM Codes›A00–B99›A65-A69›A69

ICD-10-CM A69.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A69.9 is a billable ICD-10-CM diagnosis code for spirochetal infection, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. Coders also document this condition as arthritis caused by Spirochaetales. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
A69.9
Billable Status
Yes — Valid for Submission
Code Describes
Spirochetal infection, unspecified
Short Description
Spirochetal infection, unspecified
Same as the full description in the CMS dataset.
Parent Code
A69
Other spirochetal infections

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA65-A69Other spirochetal diseases
CategoryA69Other spirochetal infections
This CodeA69.9Spirochetal infection, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis caused by Spirochaetales
  • Infection of colon caused by Spirochaetes
  • Meningitis caused by Spirochaetes
  • Spirochetal infection

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A69.9: its own notes plus those printed at block A65-A69 and 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 Block A65-A69 Other spirochetal diseases applies to 28 codes
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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A69.9, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming A69.9: they are not reported together with it, unless the two conditions are unrelated.

  • A49 Bacterial infection of unspecified site
    spirochetal infection NOS (A69.9)

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 INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Bacterial Infections

Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.

The full article covers:

  • What are bacteria?
  • How do bacterial infections spread?
  • What are the treatments for bacterial infections?
  • Can bacterial infections be prevented?

Read the full article at MedlinePlus

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

Convert A69.9 to ICD-9-CMHistory

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

ICD-9-CM
104.9 Spirochetal infect NOS
Exact Match The mapping is direct, with no qualifiers.

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 A69.9Overview

What is the ICD-10 code for spirochetal infection, unspecified?

The ICD-10-CM code for spirochetal infection, unspecified is A69.9 (sometimes written as A699). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A69.9 (Other spirochetal infections) a billable code?

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

What MS-DRG does A69.9 group to?

When spirochetal infection, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of A69.9?

Under the General Equivalence Mappings, spirochetal infection, unspecified converts to ICD-9-CM 104.9 (spirochetal infect NOS). The mapping is a direct match.