How To Use CPT Code 84105

CPT 84105 describes the testing of phosphate levels in a patient’s urine specimen. This article will cover the official description, procedure, qualifying circumstances, appropriate usage, documentation requirements, billing guidelines, historical information, similar codes and billing examples.

1. What is CPT Code 84105?

CPT 84105 can be used to describe the testing of phosphate levels in a patient’s urine specimen. This code is used when a lab analyst performs a test to evaluate the level of phosphate, which is phosphorus not contained in biological compounds, in a patient’s urine specimen.

2. Official Description

The official description of CPT code 84105 is: ‘Phosphorus inorganic (phosphate); urine.’

3. Procedure

1. The lab analyst receives a patient’s urine specimen for testing.
2. The lab analyst performs a test to evaluate the level of phosphate in the urine specimen.
3. This may involve reacting the urine specimen with a reagent such as ammonium molybdate.
4. The reagent reacts with phosphate in the urine to form ammonium phosphomolybdate.
5. The lab analyst quantifies the ammonium phosphomolybdate using a method such as colorimetry to determine the level of phosphate in the urine specimen.

4. Qualifying circumstances

CPT 84105 is used when clinicians order a test to evaluate the level of phosphate in a patient’s urine specimen. This test can help diagnose conditions associated with high or low urine phosphate levels. High urine phosphorus may indicate conditions such as hyperparathyroidism, vitamin D deficiency, or renal tube disorders. Low urine phosphorus may indicate problems with calcium and phosphorus metabolism, such as hypoparathyroidism.

5. When to use CPT code 84105

CPT code 84105 should be used when a clinician orders a test to evaluate the level of phosphate in a patient’s urine specimen. It is important to use this code specifically for urine phosphate testing, as there is a separate code for phosphate testing from other sources.

6. Documentation requirements

To support a claim for CPT 84105, the documentation should include:

• The reason for ordering the urine phosphate test
• The specific method used to test the urine specimen
• The date and time of the test
• The results of the test, indicating the level of phosphate in the urine specimen

7. Billing guidelines

When billing for CPT 84105, ensure that the test is performed on a patient’s urine specimen to evaluate the level of phosphate. It is important to use the appropriate CPT code for phosphate testing in urine and not for testing from other sources. Report this code once for each specimen if the clinician submits specimens from different times.

8. Historical information

CPT 84105 was added to the Current Procedural Terminology system on January 1, 1990. There have been no updates to the code since its addition.

9. Examples

1. A lab analyst performs a test on a patient’s urine specimen to evaluate the level of phosphate.
2. A clinician orders a urine phosphate test to help diagnose a patient with suspected hyperparathyroidism.
3. A patient with renal tube disorders undergoes a urine phosphate test to monitor their condition.
4. A clinician orders a urine phosphate test to assess a patient’s calcium and phosphorus metabolism.
5. A lab analyst quantifies the level of phosphate in a patient’s urine specimen using colorimetry.
6. A clinician orders a urine phosphate test to evaluate a patient’s vitamin D deficiency.
7. A patient with hypoparathyroidism undergoes a urine phosphate test to assess their calcium and phosphorus levels.
8. A lab analyst reacts a patient’s urine specimen with ammonium molybdate to test for phosphate levels.
9. A clinician orders a urine phosphate test to monitor a patient’s response to treatment for renal tube disorders.
10. A patient with suspected bone insufficiencies undergoes a urine phosphate test to assess their phosphorus levels.