CPT 86153Laboratory

Cell enumeration phys interp

CPT code 86153 covers the counting and analysis of specific immune system cells in blood or other body fluids, with a physician reviewing and interpreting the results.

Showing rates for

National Average

Base Medicare rate

$31.70

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

0.69

PE RVU (NF)

0.27

MP RVU

0.02

Total RVU

0.98

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Always document the physician's written interpretation separately from the technical report
Impact: Missing physician interpretation documentation is the #1 cause of denials, potentially losing the entire $31.70 reimbursement
Bill the global code (without modifiers) when both technical and professional components are performed in your facility
Impact: Maximizes reimbursement at full $31.70 versus split component billing
Verify medical necessity with appropriate ICD-10 codes, especially for HIV monitoring (B20-B24) or immunodeficiency (D80-D89)
Impact: Appropriate diagnosis linkage reduces denial rate by approximately 40-60%
When billing with E/M services on the same day, ensure the interpretation is separately documented and medically necessary
Impact: Prevents bundling denials; maintains separate $31.70 payment in addition to E/M service
For Medicare patients, confirm the test meets LCD/NCD requirements for frequency limitations on CD4 monitoring
Impact: Prevents medical necessity denials; some MACs limit CD4 testing frequency to every 3-6 months for stable patients
Use modifier 26 appropriately when interpreting studies performed at outside facilities
Impact: Ensures proper payment split; professional component typically receives approximately $10-12 of the total $31.70

Common denials

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Frequently asked questions

What is CPT code 86153 used for?

CPT 86153 is used for cell enumeration studies with physician interpretation, most commonly for counting and analyzing immune system cells like CD4 lymphocytes in HIV patients, lymphocyte subsets in immunodeficiency, or monitoring immune cell populations in transplant recipients.

How much does Medicare pay for CPT 86153 in 2025?

The 2025 Medicare national average payment for CPT 86153 is $31.70 for both facility and non-facility settings, based on 0.98 total RVUs and the conversion factor of 32.3465.

Does CPT 86153 require physician interpretation?

Yes, CPT 86153 specifically requires a physician to personally review the cell enumeration results and provide a written interpretation with clinical correlation. Without documented physician interpretation, the code should not be billed or will be denied.

Can I bill 86153 with modifier 26 for interpretation only?

Yes, modifier 26 should be appended when billing only the professional component (physician interpretation) when the technical laboratory work was performed at a separate facility. This typically results in payment of approximately 30-40% of the total fee.

How often can CPT 86153 be billed for HIV patients?

Frequency depends on the patient's clinical stability and Medicare LCD requirements. For stable HIV patients on effective therapy, CD4 monitoring is typically covered every 3-6 months. More frequent testing requires documentation of clinical changes, new symptoms, or treatment modifications.

What diagnosis codes support medical necessity for 86153?

Common supporting diagnosis codes include B20-B24 (HIV disease), D80-D89 (immunodeficiency disorders), Z94.* (transplant status), D89.810-D89.813 (cytokine release syndrome), and codes for immunosuppressive medication monitoring. The specific diagnosis must justify the need for immune cell enumeration.

What is the difference between CPT 86153 and other cell counting codes?

CPT 86153 specifically includes physician interpretation of cell enumeration studies, distinguishing it from automated cell counts. It differs from 86359-86361 (T-cell subset typing) and 86152 (cell enumeration using immunologic selection) based on the methodology and specific cell populations being analyzed.