Lab CPT Reference

Clinical Laboratory CPT Codes and Reimbursement Rates

Clinical laboratory billing relies on a distinct set of CPT codes organized by test methodology, from routine chemistry panels (80048-80076) to molecular diagnostics and flow cytometry.

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Clinical Laboratory CPT Codes and Reimbursement Rates
01

CMP (80053) reimburses ~$14 Medicare. Never double-bill panel components individually.

02

Vitamin D (82306, ~$40) and TSH (84443, ~$23) are among the highest-reimbursing individual chemistry tests

03

CBC with diff (85025, ~$11) may be downcoded to 85027 (~$8) if diagnosis does not support differential

04

CLIA number must appear on every claim. Wrong CLIA certificate category causes denials.

Overview

Why Clinical Laboratory CPT Codes Teams Need a Better Workflow

Clinical laboratory billing relies on a distinct set of CPT codes organized by test methodology, from routine chemistry panels (80048-80076) to molecular diagnostics and flow cytometry. The sheer number of available lab codes and the frequency of annual CPT updates make staying current a constant challenge.

This reference covers the CPT codes most commonly billed by clinical laboratories. Sections address panel vs. individual test coding, modifier usage for repeat and reflex testing, and the documentation rules for advanced molecular and genetic testing services.

Why Clinical Laboratory CPT Codes Teams Need a Better Workflow
Challenges

Common Clinical Laboratory CPT Codes Challenges We Solve

Every Clinical Laboratory CPT Codes team deals with payer delays, coding nuance, and collection leakage.

CMP (80053) reimburses ~$14 Medicare. Never double-bill panel components individually.

The workflow has to support this issue before claim submission, or it turns into avoidable rework after the payer responds.

Vitamin D (82306, ~$40) and TSH (84443, ~$23) are among the highest-reimbursing individual chemistry tests

When this area is inconsistent, denial rate, payment timing, and staff follow-up effort all get worse at the same time.

CBC with diff (85025, ~$11) may be downcoded to 85027 (~$8) if diagnosis does not support differential

Tight documentation and coding controls here usually improve both reimbursement accuracy and operational speed.

CLIA number must appear on every claim. Wrong CLIA certificate category causes denials.

This is one of the first places revenue leakage shows up when specialty billing habits are not standardized.

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The Complete Guide to Clinical Laboratory CPT Codes

Clinical Laboratory CPT Code Structure

Clinical laboratory billing operates on a fundamentally different model than most medical specialties. Lab tests are high-volume, low-reimbursement services governed by the Medicare Clinical Laboratory Fee Schedule (CLFS), which sets maximum payment amounts that most payers use as a benchmark. A busy reference laboratory processes thousands of tests daily at reimbursement rates ranging from $5 to $50 per test. Revenue depends entirely on volume, coding accuracy, and efficient claim processing. A 2% coding error rate across 10,000 daily tests creates 200 daily errors that compound into significant annual revenue loss.

Lab Panel Codes (80047-80076)

Lab panels are predefined groups of tests billed under a single CPT code. Basic Metabolic Panel (BMP): 80048 (includes glucose, calcium, sodium, potassium, chloride, CO2, BUN, creatinine; approximately $11 Medicare CLFS). Comprehensive Metabolic Panel (CMP): 80053 (adds albumin, bilirubin, alkaline phosphatase, protein, ALT, AST to the BMP components; approximately $14). Lipid Panel: 80061 (total cholesterol, HDL, triglycerides; approximately $18). Hepatic Function Panel: 80076 (albumin, bilirubin direct and total, alkaline phosphatase, protein, ALT, AST, GGT; approximately $11).

The critical billing rule for panels is that you cannot bill a panel code and also separately bill individual components that are included in the panel. If a CMP (80053) and a separate glucose (82947) are ordered, only the CMP is billable because glucose is a component of the CMP. However, if a CMP and a magnesium (83735) are ordered, both are billable because magnesium is not included in the CMP. Understanding panel composition prevents both underbilling (missing the panel code) and overbilling (double-billing panel components).

Chemistry Tests (82000-84999)

Individual chemistry tests are billed when they are not part of an ordered panel. Common high-volume codes include: 82947 (glucose, approximately $5), 82607 (vitamin B12, approximately $18), 82306 (vitamin D 25-hydroxy, approximately $40), 83036 (hemoglobin A1c, approximately $13), 84443 (TSH, approximately $23), 82728 (ferritin, approximately $16), 83735 (magnesium, approximately $8), and 84153 (PSA, approximately $25). Thyroid panels are not defined as a formal CPT panel code, so individual codes must be used: 84443 (TSH), 84436 (thyroxine total), 84439 (free T4), 84480 (triiodothyronine T3 total), 84481 (free T3).

Hematology (85004-85999)

Complete Blood Count (CBC) codes: 85025 (CBC with automated differential, approximately $11) and 85027 (CBC with automated count only, approximately $8). The manual differential (85004, approximately $7) is an add-on when the automated analyzer flags abnormalities requiring manual review. Coagulation tests: 85610 (prothrombin time/PT, approximately $6), 85730 (partial thromboplastin time/PTT, approximately $9), 85379 (D-dimer quantitative, approximately $14). Erythrocyte sedimentation rate: 85652 (ESR, approximately $5).

The CBC is the single highest-volume laboratory test. Practices that order 85025 (with differential) when only 85027 (without differential) is clinically indicated do not incur a billing error, but payers may downcode to 85027 if the diagnosis does not support the differential component. Ensure the diagnosis code supports the test ordered.

Microbiology (87000-87999)

Microbiology codes cover cultures, sensitivities, and molecular testing. Urine culture: 87086 (quantitative colony count, approximately $10). Blood culture: 87040 (aerobic, approximately $12). Culture sensitivity: 87186 (MIC method, approximately $10 per organism). Rapid molecular tests: 87804 (influenza rapid antigen, approximately $17), 87880 (strep A rapid antigen, approximately $17), 87426 (SARS-CoV-2 antigen, approximately $35). Molecular panel testing: 87633 (respiratory virus panel, 12-25 targets, approximately $150 to $300 depending on the number of targets).

CLIA Compliance and Billing

Every laboratory performing testing must hold an appropriate CLIA certificate. The CLIA number must appear on every claim. Waived tests (CLIA Certificate of Waiver) include rapid strep, urine dipstick, glucose fingerstick, and rapid flu. Moderate and high-complexity tests require a CLIA certificate of compliance or accreditation. Billing for tests performed under the wrong CLIA certificate category results in claim denial and potential compliance violations. Ensure the laboratory CLIA certificate covers the complexity level of every test billed.

Common Clinical Laboratory CPT Codes and Rates

CPT Code Description Medicare CLFS Rate (Approx.)
80053 Comprehensive Metabolic Panel $14
85025 CBC with automated differential $11
83036 Hemoglobin A1c $13
84443 Thyroid Stimulating Hormone (TSH) $23
82306 Vitamin D, 25-hydroxy $40
80061 Lipid Panel $18
Common Questions

Clinical Laboratory CPT Codes FAQ

Answers to the questions practice owners ask most often.

You can bill a panel and additional individual tests that are NOT included in the panel on the same claim. For example, a CMP (80053) and a magnesium (83735) are billable together because magnesium is not a CMP component. However, you cannot bill a CMP and a separate glucose (82947) because glucose is already included in the CMP. If all individual tests ordered match the panel components, bill the panel code. If additional tests beyond the panel are ordered, bill the panel plus the additional individual codes.

CPT 85025 is a CBC with an automated white blood cell differential (breaking out neutrophils, lymphocytes, monocytes, eosinophils, basophils). CPT 85027 is a CBC with automated counts only (WBC, RBC, hemoglobin, hematocrit, platelets) without the differential breakdown. Use 85025 when the clinical situation requires knowing the WBC differential (infection workup, hematologic conditions). Use 85027 for routine screening where only the total counts are needed.

The CLIA certificate type determines which tests the laboratory can perform and bill. A Certificate of Waiver allows only FDA-waived tests (rapid antigen tests, urine dipstick, fingerstick glucose). A Certificate of Compliance or Accreditation is required for moderate and high-complexity testing (cultures, chemistry analyzers, hematology analyzers). Billing for a moderate-complexity test under a waived certificate results in denial. The CLIA number must appear on every laboratory claim for Medicare and most other payers.

Medicare reimburses respiratory virus molecular panels under the CLFS, but reimbursement has decreased significantly from initial rates. Commercial payer coverage varies widely. Some commercial plans cover the panel at $150 to $300, while others limit coverage to high-risk patients or specific clinical settings (emergency department, inpatient). Prior authorization may be required by some commercial plans for molecular panel testing. Verify payer-specific coverage before performing high-cost molecular panels.

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