Summary & Overview
CPT 84120: Urine Porphyrin Analysis, Quantitative
CPT code 84120 covers laboratory measurement of porphyrin compounds in a urine specimen, a diagnostic assay used to evaluate disorders of heme synthesis such as porphyrias. Nationally, porphyrin testing is an important, specialized diagnostic service used by clinicians when biochemical evidence of porphyrin metabolism abnormalities is suspected. The code represents a laboratory procedure that can inform clinical management, genetic testing decisions, and specialist referral.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a concise overview of coding context, payer coverage patterns, typical sites of service, and clinical indications for testing. The publication summarizes common modifiers and operational considerations, and highlights what to expect in terms of clinical context and billing workflow for porphyrin urine analysis.
This summary provides clinicians, laboratory managers, and revenue cycle staff with the clinical framing and billing identification needed to recognize when CPT code 84120 applies, where the service is typically performed, and which major payers are relevant for coverage discussions. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 84120 describes a laboratory test in which a lab analyst measures levels of various porphyrin compounds in a urine specimen. This assay evaluates porphyrins that can indicate disorders of heme synthesis and aid in the diagnosis of conditions such as porphyrias.
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Service type: Clinical laboratory biochemical analysis of urine porphyrins
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Typical site of service: Clinical laboratory or hospital laboratory processing a patient urine specimen
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Clinical & Coding Specifications
Clinical Context
A patient presents with recurrent abdominal pain, neuropathic symptoms, or unexplained darkening of urine suspicious for a porphyria or porphyrin metabolism disorder. The clinician orders a urine porphyrin panel to quantify urinary porphyrin compounds. A typical workflow: a urine specimen (random, timed, or 24-hour) is collected at the outpatient clinic, emergency department, or inpatient ward and labeled with patient identifiers and collection time. The specimen is transported to the clinical laboratory where a laboratory analyst performs extraction and chromatographic or mass spectrometric analysis to measure levels of uroporphyrin, coproporphyrin, and other porphyrins. Results are reviewed by the laboratory and released to the ordering provider; abnormal patterns prompt clinical correlation with history, medication review, and possible referral to hematology, genetics, or a porphyria specialty center. Typical sites of service include outpatient laboratory facilities, hospital clinical laboratories, and reference laboratories that perform specialized biochemical testing.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the professional interpretation portion if separated from technical component |
TC |