Summary & Overview
CPT 85018: Hemoglobin Blood Count Laboratory Test
CPT code 85018 represents the laboratory analysis of hemoglobin levels in a patient's blood, a key indicator for diagnosing and monitoring anemia and other blood-related conditions. This procedure is widely performed in office-based settings and is a cornerstone of routine clinical care across the United States. The code is recognized and reimbursed by major national payers, including Aetna, Blue Cross Blue Shield, Cigna Health, and UnitedHealthcare, reflecting its broad clinical and billing relevance.
This publication provides a comprehensive overview of CPT code 85018, covering payer coverage, clinical context, and related coding considerations. Readers will gain insights into common modifiers such as QW for CLIA-waived tests and 59 for distinct procedural services, as well as associated provider taxonomies and relevant ICD-10 diagnoses. The analysis also highlights related CPT codes for complete blood counts and specialized cell counts, offering context for how hemoglobin testing fits within broader laboratory workflows. Policy updates, coding benchmarks, and clinical applications are discussed to inform stakeholders about current practices and trends in hemoglobin testing.
CPT Code Overview
CPT code 85018 is used to report a blood count procedure specifically measuring hemoglobin levels. This test is a fundamental component of pathology and laboratory procedures, providing critical information about a patient's blood health. The typical site of service for this procedure is an office setting, designated as Place of Service 11. Hemoglobin measurement is essential for diagnosing and monitoring conditions such as anemia and other blood disorders, making it a routine and widely utilized laboratory test in clinical practice.
Clinical & Coding Specifications
Clinical Context
A patient presents to a primary care office, such as a family medicine or internal medicine practice, with symptoms like fatigue, weakness, or pallor. The clinician suspects anemia or wants to screen for blood disorders. A blood sample is collected and sent to a clinical medical laboratory for analysis. The laboratory performs a hemoglobin measurement using CPT code 85018 to assess the patient's hemoglobin level. This test helps diagnose or monitor conditions such as iron deficiency anemia or other causes of low hemoglobin. The workflow typically involves ordering the test, collecting the specimen, laboratory analysis, and reporting results to the provider for clinical interpretation.
Coding Specifications
-
Modifier
QW: Used when the hemoglobin test is performed as a CLIA-waived procedure, indicating it meets the requirements for simple laboratory testing. -
Modifier
59: Applied to denote a distinct procedural service, such as when the hemoglobin test is performed separately from other laboratory tests on the same day.
| Modifier Code | Description |
|---|---|
QW | CLIA waived test |
59 | Distinct Procedural Service |
- Provider Taxonomies:
| Taxonomy Code | Specialty |
|---|---|
291U00000X | Clinical Medical Laboratory |
207Q00000X | Family Medicine Physician |
207R00000X | Internal Medicine Physician |
These taxonomies represent the clinical laboratory performing the test and the physicians who may order and interpret the results.
Related Diagnoses
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D50.9: Iron deficiency anemia, unspecified- Relevant for patients with suspected or confirmed iron deficiency anemia; hemoglobin testing is essential for diagnosis and monitoring.
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D64.9: Anemia, unspecified- Used when anemia is present but the specific cause is not determined; hemoglobin measurement is a key diagnostic tool.
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R53.83: Other fatigue- Fatigue is a common symptom prompting hemoglobin testing to rule out anemia.
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R68.89: Other general symptoms and signs- General symptoms may lead to hemoglobin testing as part of a broader diagnostic workup.
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Z13.0: Encounter for screening for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism- Used for screening purposes; hemoglobin testing is a standard screening tool for blood disorders.
Related CPT Codes
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85025: Complete (CBC), automated (HgB, Hct, RBC, WBC and platelet count) and automated differential WBC count- Includes hemoglobin measurement as part of a comprehensive blood count; often used when a broader assessment is needed.
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85027: Complete (CBC), automated (HgB, Hct, RBC, WBC and platelet count)- Similar to
85025but without the automated differential; includes hemoglobin.
- Similar to
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85032: Manual cell count each- Used for manual counting of blood cells; may be performed alongside hemoglobin testing in certain cases.
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85041: Automated RBC count- Measures red blood cell count; often ordered with hemoglobin to assess anemia.
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85044: Manual reticulocyte count- Evaluates reticulocyte levels; relevant in anemia workup.
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85045: Automated reticulocyte count- Automated version of reticulocyte count; used in anemia evaluation.
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85046: Reticyte/Hgb concentrate- Measures reticulocyte hemoglobin concentration; provides additional information in anemia diagnosis.
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85048: Automated leukocyte count- Assesses white blood cell count; may be ordered with hemoglobin in broader blood analysis.
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85049: Automated platelet count- Evaluates platelet levels; commonly included in CBC panels.
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85055: Reticulated platelet assay- Specialized platelet analysis; less commonly ordered but may be relevant in certain hematologic conditions.
Many of these codes are used together in comprehensive blood panels (CBC) or as alternatives depending on the clinical need. 85018 may be ordered alone or as part of a broader panel.
National Reimbursement Benchmarks
National mean rates for CPT code 85018 show that BUCA (average commercial) payers reimburse at $4.24, while UnitedHealth Group offers the lowest mean rate among the major commercial payers at $2.34. Blue Cross Blue Shield and Cigna fall in the middle, with mean rates of $3.09 and $4.68, respectively. Aetna has the highest mean rate at $5.26.
Rate dispersion, measured by the difference between the 75th and 25th percentiles, varies across payers. Aetna exhibits the widest spread ($2.47), indicating greater variability in rates, while Blue Cross Blue Shield and BUCA have tighter ranges ($1.57 and $1.13, respectively). UnitedHealth Group and Cigna also show moderate dispersion ($2.00 and $1.84).
The table and chart below present a detailed breakdown of national benchmarks for each payer, including mean rates and percentile values.
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