2027 ICD-10-CM Diagnosis Code A49.3Mycoplasma infection, unspecified site
ICD-10-CM Codes›A00–B99›A30-A49›A49
- Billable — Valid for Submission
- Not Chronic
A49.3 is a billable ICD-10-CM diagnosis code for mycoplasma infection, unspecified site. 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 infection caused by Mycoplasmoides pneumoniae. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Infection caused by Mycoplasmoides pneumoniae
- Infertility due to infection
- Male infertility due to Mycoplasma infection
- Mycoplasma genitalium infection
- Mycoplasma infection
- Mycoplasmal anemia
- Mycoplasmal postabortal fever
- Mycoplasmal postpartum fever
- Pelvic inflammatory disease caused by Metamycoplasma hominis
- Puerperal pyrexia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A49.3: its own notes plus those printed at A49 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.
- diseases generally recognized as communicable or transmissible
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- 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.
- 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.
Clinical InformationClinical
Mycoplasma Infections
infections with species of the genus mycoplasma.
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 A49.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A49.3Overview
What is the ICD-10 code for mycoplasma infection, unspecified site?
The ICD-10-CM code for mycoplasma infection, unspecified site is A49.3 (sometimes written as A493). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A49.3 (Bacterial infection of unspecified site) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report mycoplasma infection, unspecified site on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A49.3 group to?
When mycoplasma infection, unspecified site 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.
Can A49.3 be reported with A39.9?
Not as a rule. The Excludes1 note at A49, which applies to A49.3, lists "meningococcal infection NOS (A39.9)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of A49.3?
Under the General Equivalence Mappings, mycoplasma infection, unspecified site converts to ICD-9-CM 041.81 (mycoplasma). The mapping is approximate, so confirm the match fits the documentation.
