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LOINC Code 77165-9: A. phagocytophilum and Ehrlichia chaffeensis IgG panel (S) [Titer]

77165-9 is a LOINC code used to identify A. phagocytophilum and Ehrlichia chaffeensis IgG panel (S) [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 Anaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Anaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel. It is commonly used with the system or sample type Ser.

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: Order
  • Panel type: Panel

What it does not mean

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

Key facts

Anaplasma phagocytophilum and Ehrlichia chaffeensis IgG panel [Titer] - Serum
Anaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel
Ehrlichiosis is a general name to describe several bacterial diseases affecting humans and animals that are transmitted by tick bites. In the United States, the term "ehrlichiosis" may be broadly applied to several different infections. Ehrlichia chaffeensis and Ehrlichia ewingii are transmitted by the lonestar tick in the southeastern and southcentral United States. In addition, a third Ehrlichia species provisionally called Ehrlichia muris-like (EML) has been identified in a small number of patients residing in or traveling to Minnesota and Wisconsin; a tick vector for the EML organism has not yet been established. The symptoms caused by infection with these Ehrlichia species usually develop 1-2 weeks after being bitten by an infected tick. The tick bite is usually painless, and about half of the people who develop ehrlichiosis may not even remember being bitten by a tick. [CDCEhrlichiosis] This panel contains IgG antibody tests for two infecting species, E. charffeensis and A. phagocytophilum.
A phagocyt + E chaff Ab.IgG Pnl; Anaplasmosis; Dilution factor; Dilution Factor (Titer); E chaffeensis; E equi; E phagocytophila; Ehrlichia equi; Ehrlichia phagocytophila; Ehrlichiosis serology; HGE; HME; Human granulocytic ehrlichiosis; Human monocytic ehrlichiosis; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Pan; PANEL.MICROBIOLOGY; Panl; Pnl; Point in time; Random; Serum; SmQn; SR; Tick Borne Diseases; Titer; Titered; Titre; Ttr

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

A. phagocytophilum and Ehrlichia chaffeensis IgG panel (S) [Titer]Anaplasma phagocytophilum and Ehrlichia chaffeensis IgG panel [Titer] - SerumA phagocyt + E chaff Ab.IgG Pnl Titr SerAnaplasma phagocytophilum & Ehrlichia chaffeensis IgG panelPANEL.MICROAnaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel, BloodTitr

Frequently asked questions

Code details

Code77165-9
SystemLOINC
Display nameA. phagocytophilum and Ehrlichia chaffeensis IgG panel (S) [Titer]
DescriptionAnaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel
Short nameA phagocyt + E chaff Ab.IgG Pnl Titr Ser
ComponentAnaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel
PropertyTitr
TimingPt
System (specimen)Ser
ScaleSemiQn
ClassPANEL.MICRO
StatusACTIVE
Order/ObservationOrder

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.52
Last changed2.75

Consumer names

Anaplasma phagocytophilum & Ehrlichia chaffeensis IgG panel, Blood

Part names

Anaplasma phagocytophilum & Ehrlichia chaffeensis IgG panelTitrPtSerSemiQnAnaplasma phagocytophilum and Ehrlichia chaffeensis IgG panelTiterPoint in time (spot)Serum

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 77165-9 | HealthAssure