CPT 80504Laboratory

Path clin consltj mod 21-40

CPT 80504 covers a pathology consultation where a pathologist reviews test results and provides clinical advice to help guide patient care for moderately complex cases requiring 21-40 minutes of work.

Showing rates for

National Average

Base Medicare rate

$50.78

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

0.91

PE RVU (NF)

0.62

MP RVU

0.04

Total RVU

1.57

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

NCCI bundling edits

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Billing tips

Document precise start and stop times for the consultation to verify the 21-40 minute time requirement
Impact: Time documentation is essential for audit defense; insufficient time documentation is the #1 cause of denials, potentially costing $50.78 per claim
Maintain written or electronic records of physician-to-physician communication showing what was discussed and recommended
Impact: CMS requires evidence of actual consultation, not just review; lack of communication documentation can trigger recoupment of all 80504 payments in an audit
Bill 80504 only when providing interpretive consultation beyond what is included in the primary laboratory test's interpretation
Impact: Unbundling from included interpretive services violates CMS rules; proper distinction prevents denials and maintains compliance
Use 80504 instead of 80503 when total time exceeds 20 minutes but remains under 41 minutes
Impact: 80503 covers up to 20 minutes; proper code selection based on documented time ensures correct reimbursement and avoids downcoding
Document the complexity factors justifying moderate complexity designation, such as number of data points reviewed and risk of the clinical scenario
Impact: Complexity documentation supports medical necessity; Medicare may deny claims lacking justification for moderate complexity designation
Bill on the date the consultation is completed and communicated, not the date specimens were collected or tests resulted
Impact: Incorrect date of service can cause coordination of benefits issues and denials; proper dating ensures timely filing and accurate claims processing

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 80504 in 2025?

The 2025 Medicare national average payment for CPT 80504 is $50.78 in non-facility settings and $44.96 in facility settings, based on the CMS Physician Fee Schedule with a conversion factor of 32.3465.

How many RVUs is CPT code 80504 worth?

CPT 80504 has a total RVU value of 1.57, consisting of 0.91 work RVUs, 0.62 practice expense RVUs (non-facility), and 0.04 malpractice RVUs.

What is the difference between CPT 80503 and 80504?

The primary difference is time duration: CPT 80503 covers pathology clinical consultations requiring up to 20 minutes, while 80504 covers moderate complexity consultations requiring 21-40 minutes of physician time. Code selection must be based on documented time spent.

Who can bill CPT code 80504?

Only licensed physicians with training in pathology or laboratory medicine can bill CPT 80504. It cannot be billed by laboratory technologists, supervisors, or other non-physician personnel. The physician must personally perform and document the consultation.

How do I document time for CPT 80504 billing?

Document the exact start and stop times of the consultation activity in the medical record. Include the total elapsed time (which must be 21-40 minutes) and describe activities performed during that period, such as reviewing lab data, correlating clinical information, formulating recommendations, and communicating with the requesting physician.

Can CPT 80504 be billed with other laboratory codes on the same day?

Yes, but the consultation must represent distinct physician work beyond the interpretation included in the primary laboratory test. Documentation must clearly show the additional interpretive and consultative work justifies separate billing, and the services must address separate clinical needs.

What documentation is needed to bill CPT 80504 to Medicare?

Required documentation includes the requesting physician's name and clinical question, start/stop times totaling 21-40 minutes, laboratory data reviewed, clinical correlation performed, specific recommendations provided, evidence of physician-to-physician communication, and the pathologist's signature. All elements must be clearly documented in the medical record.