2025 CPT code 84105
(Active) Effective Date: N/A Revision Date: N/A Laboratory - Chemistry Procedures Pathology and Laboratory Procedures > Chemistry Procedures Feed
This code reports the quantitative measurement of inorganic phosphorus (phosphate) in a urine specimen.
Modifiers may apply depending on the circumstances, such as modifier 90 for reference laboratory testing.Consult the CPT manual for appropriate modifier usage.
Medical necessity is established when the physician orders the test based on clinical presentation or to investigate specific symptoms, such as recurrent kidney stones, symptoms suggestive of hyperparathyroidism or renal tubular disorders.The results inform treatment and management decisions.
Clinical laboratory personnel perform the analysis. Ordering physician interprets the results in the context of patient history and other diagnostic information.
In simple words: This lab test measures the amount of phosphate in a urine sample collected over 24 hours. Phosphate is a mineral important for bones, nerves, and energy production.High or low phosphate levels can indicate kidney problems or other health issues.
This CPT code, 84105, encompasses the analytical determination of inorganic phosphorus (phosphate) concentration within a urine sample.The procedure involves quantitative analysis, typically employing methods such as colorimetry, to measure the phosphate level.A 24-hour urine collection is generally preferred due to the diurnal variation in urinary phosphate excretion.The test is ordered to help assess kidney function, identify metabolic disorders involving phosphorus and calcium balance, and aid in the diagnosis of conditions associated with altered phosphate excretion, such as hyperparathyroidism, vitamin D imbalances, or renal tubular disorders like Fanconi syndrome. Results are interpreted considering both urinary and serum phosphate concentrations.
Example 1: A patient presents with recurrent kidney stones.A 24-hour urine collection is obtained to assess urinary phosphate levels as part of a metabolic evaluation., A patient exhibits symptoms suggestive of hyperparathyroidism.Urinary phosphate analysis is ordered in conjunction with serum phosphate and parathyroid hormone measurements., A patient with suspected Fanconi syndrome undergoes evaluation.Urinary phosphate levels are assessed to evaluate renal tubular function.
Physician's order specifying the test, patient demographics, date and time of collection (if multiple collections), specimen handling and transport documentation, complete lab report including the quantitative phosphate result with units, and any relevant clinical notes.
** The interpretation of urinary phosphate levels must be considered in conjunction with serum phosphate, calcium, and other relevant clinical information.Diurnal variation should be considered, and a 24-hour urine collection is typically preferred for accurate assessment.Refer to current clinical guidelines and laboratory reference ranges for proper interpretation.
- Revenue Code: T1H (LAB TESTS - OTHER (NON-MEDICARE FEE SCHEDULE))
- RVU: Information not available in provided source.Refer to current fee schedules and local reimbursement guidelines.
- Global Days: Not applicable. This is a laboratory test, not a surgical procedure.
- Payment Status: Active
- Modifier TC rule: Not applicable; this code represents a complete laboratory procedure.
- Fee Schedule: Information not available in the provided source. Refer to historical CPT fee schedules for relevant data.
- Specialties:Nephrology, Endocrinology, Internal Medicine, Pediatrics
- Place of Service:Laboratory, Hospital (Inpatient/Outpatient), Physician's Office