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LOINC Code 22173-9: C. pneumoniae IgM (CSF) [Titer]

22173-9 is a LOINC code used to identify C. pneumoniae IgM (CSF) [Titer] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Chlamydophila pneumoniae Ab.IgM. It is commonly used with the system or sample type CSF.

Reviewed by HealthAssure Clinical TeamUpdated 25 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Chlamydophila pneumoniae Ab.IgM. It is commonly used with the system or sample type CSF.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Both

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Chlamydophila pneumoniae IgM Ab [Titer] in Cerebral spinal fluid
  • Chlamydophila pneumoniae Ab.IgM
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; C pneum; C pneumo; C pneumoniae; Cerebral spinal fluid; Cerebrospinal Fl; Chlamydia; Chlamydia pneumoniae; CPN; Dilution factor; Dilution Factor (Titer); ID; Immune globulin M; Immunoglobulin M; Infectious Disease; InfectiousDisease; Microbiology; Neuro; Neurology; Pneu; pneum; Pneumo; Pneumon; Pneumonia; Point in time; Random; SmQn; Spinal Fl; Spinal Fld; Spinal Flu; Spinal Fluid; Titer; Titered; Titre; Ttr; Twar agent

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

C. pneumoniae IgM (CSF) [Titer]Chlamydophila pneumoniae IgM Ab [Titer] in Cerebral spinal fluidC pneum IgM Titr CSFChlamydophila pneumoniae Ab.IgMMICROChlamydophila pneumoniae IgM antibody, Spinal fluidTitr

Frequently asked questions

Code details

Code22173-9
SystemLOINC
Display nameC. pneumoniae IgM (CSF) [Titer]
DescriptionChlamydophila pneumoniae Ab.IgM
Short nameC pneum IgM Titr CSF
ComponentChlamydophila pneumoniae Ab.IgM
PropertyTitr
TimingPt
System (specimen)CSF
ScaleSemiQn
ClassMICRO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0n
Last changed2.75

Consumer names

Chlamydophila pneumoniae IgM antibody, Spinal fluid

Part names

Chlamydophila pneumoniae Ab.IgMTitrPtCSFSemiQnChlamydophila pneumoniae IgMTiterPoint in time (spot)Cerebral spinal fluid

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 22173-9 | HealthAssure