Chlamydia psittaci infections
In Other diseases caused by chlamydiae (A70-A74), chapter 1: Certain Infectious and Parasitic Diseases
- A70 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under A70-A74 below.
- As a secondary diagnosis it is a CC (complication or comorbidity), which can raise the MS-DRG payment. It doesn't count when the principal diagnosis is one of 1 closely related codes.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
Also indexed as: Chlamydia, psittaci; Fever, parrot; Infection, Chlamydia, chlamydial, psittaci; Ornithosis; Parrot fever; Pneumonia, in, ornithosis; Pneumonia, in, psittacosis; Pneumonia, psittacosis; Psittacosis
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Instructional notes
Includes: conditions that are coded here
- Ornithosis
- Parrot fever
- Psittacosis
Also applies, from Other diseases caused by chlamydiae (A70-A74)
These notes sit on A70-A74 and apply to every code under it, including A70.
Excludes1: not coded here, use a different code
- sexually transmitted chlamydial diseases (A55-A56)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
Other codes under A70-A74
Other diseases caused by chlamydiae (A70-A74)
- A70Chlamydia psittaci infections(this code)
- A71Trachoma
- A74Other diseases caused by chlamydiae
A70 MS-DRGs
As the principal diagnosis, A70 groups to MS-DRG 865 or 866 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
A70 is in Bacterial infections (INF003, its default category), with 398 codes. Others in it:
Medicare coverage articles listing A70
This Medicare billing and coding article lists A70 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about bacterial infections on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 073.9 Ornithosis, unspecified (approximate)