All ICD10 Codes

A70

Billable
ChapterA00–B99
Rankcategory
Official Description

Chlamydia psittaci infections

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

CH1 Parent Instructions

Includes
  • diseases generally recognized as communicable or transmissible
Excludes1(Not coded here)
  • certain localized infections - see body system-related chapters
Excludes2(Not included here)
  • carrier or suspected carrier of infectious disease (Z22.-)
  • 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
  • code to identify resistance to antimicrobial drugs (Z16.-)

A70-A74 Parent Instructions

Excludes1(Not coded here)
  • sexually transmitted chlamydial diseases (A55-A56)

Instructional Notes

Includes
  • Ornithosis
  • Parrot fever
  • Psittacosis

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)
A70-A74Other diseases caused by chlamydiae (A70-A74)
A70Chlamydia psittaci infections

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A70:

blockA70-A74
Other diseases caused by chlamydiae (A70-A74)
View context instructions
chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A70. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

9 raw paths
Chlamydia, chlamydial1 unique routes
psittaci (infection)→A70
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)1 unique routes
parrot→A70
Infection, infected, infective (opportunistic)1 unique routes
Chlamydia, chlamydial
psittaci→A70
Ornithosis1 unique routes
Direct index entry→A70
Parrot fever1 unique routes
Direct index entry→A70
Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)3 unique routes
in (due to)(2 variants)
ornithosis→A70
psittacosis→A70
psittacosis→A70
Psittacosis1 unique routes
Direct index entry→A70

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 865
Viral Illness with MCC
DRG 866
Viral Illness without MCC

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Chlamydia psittaci infections.

Search PCS Codes