CPT® Code 84022

Official Description

Phenothiazine

Common Language Description

The CPT® Code 84022 refers to a laboratory test that measures the levels of phenothiazine in the blood or urine. Phenothiazines are a group of medications primarily used as neuroleptic antipsychotics, which means they are often prescribed to manage psychiatric conditions such as schizophrenia and severe anxiety disorders. In addition to their antipsychotic effects, many phenothiazines also possess antihistamine and antiemetic properties, making them useful in treating nausea and allergic reactions. The measurement of phenothiazine levels is crucial for several reasons; it can help healthcare providers monitor therapeutic drug levels to ensure they are within a safe and effective range, as well as screen for potential exposure to these medications. The test involves obtaining a blood sample through a procedure known as venipuncture, which is separately reportable, and a urine specimen collected via random voiding. The analysis of these samples is typically conducted using advanced techniques such as chromatography coupled with mass spectrometry, which allows for precise quantification of the drug levels in the specimens.

1. Indications

The phenothiazine level test (CPT® Code 84022) is indicated for the following conditions:

Monitoring Therapeutic Drug Levels This test is performed to ensure that the levels of phenothiazine in the patient's system are within the therapeutic range, which is essential for effective treatment while minimizing the risk of toxicity.
Screening for Exposure The test may also be ordered to determine if a patient has been exposed to phenothiazines, which can be important in cases of suspected overdose or adverse reactions.

2. Procedure

The procedure for obtaining phenothiazine levels involves several key steps, which are outlined below:

Step 1: Sample Collection A blood sample is collected through a process known as venipuncture, where a needle is inserted into a vein to draw blood. This step is crucial as it provides the necessary specimen for measuring phenothiazine levels in the bloodstream. Additionally, a urine specimen is obtained through random voiding, which involves the patient urinating into a container. This urine sample is also analyzed to assess phenothiazine levels.
Step 2: Laboratory Analysis Once the blood and urine samples are collected, they are sent to a laboratory for analysis. The testing is typically performed using chromatography coupled with mass spectrometry, a sophisticated technique that allows for the accurate measurement of phenothiazine concentrations in the samples. This method is preferred due to its sensitivity and specificity, ensuring reliable results.

3. Post-Procedure

After the procedure, patients may be advised to resume normal activities unless otherwise directed by their healthcare provider. There are generally no specific post-procedure care requirements for this test, but patients should be informed about potential side effects from the venipuncture, such as bruising or discomfort at the site of blood draw. Results from the phenothiazine level test will typically be reviewed by the healthcare provider to determine if any adjustments to medication or further action are necessary based on the findings.

Short Descr	ASSAY OF PHENOTHIAZINE
Medium Descr	ASSAY OF PHENOTHIAZINE
Long Descr	Phenothiazine
Status Code	Statutory Exclusion (from MPFS, may be paid under other methodologies)
Global Days	XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC)	9 - Not Applicable
Multiple Procedures (51)	9 - Concept does not apply.
Bilateral Surgery (50)	9 - Concept does not apply.
Physician Supervisions	9 - Concept does not apply.
Assistant Surgeon (80, 82)	9 - Concept does not apply.
Co-Surgeons (62)	9 - Concept does not apply.
Team Surgery (66)	9 - Concept does not apply.
Diagnostic Imaging Family	99 - Concept Does Not Apply
APC Status Indicator	Items and Services Packaged into APC Rates
Type of Service (TOS)	5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS)	T1H - Lab tests - other (non-Medicare fee schedule)
MUE	Not applicable/unspecified.
CCS Clinical Classification	206 - Microscopic examination (bacterial smear, culture, toxicology)