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CPT 85008: Blood Smear Morphologic Review Without Differential

CPT code 85008 denotes a microscopic review of a peripheral blood smear by a laboratory analyst without performing a differential white blood cell count. This focused morphologic examination is used to identify overt abnormalities in red cells, white cells, and platelets that may prompt further testing or immediate clinical attention. Nationally, such reviews support diagnostic workflows in inpatient and outpatient laboratory settings and affect laboratory billing, utilization monitoring, and quality reporting.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication summarizes how payers commonly classify and reimburse microscopic smear reviews, and it outlines typical service contexts where 85008 is reported.

Readers will find concise benchmarking and utilization context, clinical scope and limitations of the service, and policy-relevant considerations affecting coverage and coding practice. The report highlights where 85008 fits within laboratory service lines, typical sites of service, and the implications for laboratory workflow and follow-up testing. Data not available in the input is noted where applicable.

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Billing Code Overview

CPT code 85008 describes a laboratory service in which a lab analyst examines a patient’s blood smear on a microscope slide without performing a differential white blood cell (WBC) count. This service is a microscopic review of a blood specimen to assess cell morphology and identify obvious abnormalities, and it does not include enumeration of WBC types.

Service type: Microscopic blood smear review (morphologic examination without differential)
Typical site of service: Clinical laboratory or hospital laboratory performing microscopic slide review

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CPT 85008: Blood Smear Morphologic Review Without Differential

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Billing Code Overview

Service type: Microscopic blood smear review (morphologic examination without differential)
Typical site of service: Clinical laboratory or hospital laboratory performing microscopic slide review

Clinical & Coding Specifications

Clinical Context

A typical patient scenario involves an adult or pediatric patient presenting to an outpatient clinic, urgent care, emergency department, or hospital laboratory where a clinician orders a basic peripheral blood smear review. The clinician suspects an abnormality suggested by automated CBC flags (for example, flagged red cell morphology, platelet clumping, or presence of atypical cells) or needs a rapid microscopic review to corroborate machine results. A phlebotomy technician draws blood into an EDTA tube, the specimen is prepared on a microscope slide by laboratory staff, and a medical technologist or laboratory analyst performs a visual examination under the microscope without performing a formal differential white blood cell count. Results reported qualitatively include presence or absence of schistocytes, spherocytes, red cell agglutination, platelet clumping, parasites, or gross abnormalities of WBC morphology. Findings are communicated to the ordering provider for clinical correlation and potential follow-up testing (for example, formal differential 85025, thick/thin malaria smears, or peripheral smear review by a hematopathologist). Typical sites of service include outpatient laboratory, hospital inpatient laboratory, emergency department, and clinic-based draw centers. Common patient indications include anemia evaluation, thrombocytopenia with platelet clumping on automated count, hemolytic markers abnormality, suspected microangiopathic hemolysis, infectious concerns (parasitemia), or quality check of automated hematology instrumentation.

Coding Specifications

Modifier	Description	When to Use
`00`	Default/No modifier	Use when no specific modifier applies to the service.
`26`	Professional component	Use when reporting only the professional component for analysis performed by the laboratory professional separate from the technical component.
`TC`	Technical component	Use when reporting only the technical component (laboratory preparation and microscopy without professional interpretation) if split billing is allowed.
`59`	Distinct procedural service	Use when the smear review is distinct from other services provided on the same day (for example, separate from a formal differential or morphology procedure).
`76`	Repeat procedure by same provider	Use if the laboratory analyst repeats the slide review during the same encounter for quality or confirmatory review.
`77`	Repeat procedure by another provider (Note: `77` is not in raw list; not used)	Data not available in the input.
`90`	Reference (outside) laboratory	Use when the slide was examined by an outside reference lab and the billing reflects that vendor service.
`91`	Repeat clinical lab test	Use when a repeat microscopic review is performed for verification of prior abnormal results.
`52`	Reduced services	Use when the procedure is partially reduced or not fully performed for clinical reasons.
`53`	Discontinued procedure	Use when the slide review was started but discontinued for documented clinical reasons.
`59`	Distinct procedural service	Use when the smear examination is separately identifiable from other lab tests on the same day.
`QK`	Ordering/Referring Physician Certification and Documentation on File	Use when required documentation for lab ordering is present per payer rules.

Taxonomy Code	Specialty	Notes
2085P0201X	Hematology	Hematologists frequently order and interpret peripheral smear findings and may review slides.
207RH0000X	Pathology	Pathologists and hematopathologists provide diagnostic review and final interpretation when abnormal or complex findings are present.
391200000X	Clinical Laboratory	Medical laboratory technologists and clinical laboratory scientists perform slide preparation and microscopy.
204SP0800X	Family Medicine	Ordering providers in primary care often request screening peripheral smear reviews for anemia or abnormal CBC.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
Data not available in the input.	Data not available in the input.	Data not available in the input.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`85025`	Automated white blood cell (WBC) differential count, including automated platelet count when performed	Performed when a formal differential count is required after a smear review suggests abnormal WBC distribution; may follow or be ordered concurrently.
`85027`	Automated reticulocyte count	Used when smear review suggests hemolysis or altered erythropoiesis prompting reticulocyte quantification.
`85379`	Peripheral blood smear, review by a physician or other qualified health care professional	Performed when a more detailed microscopic review and formal interpretation by a pathologist or hematologist is required beyond the lab analyst's basic exam.
`86580`	Skin test interpretation (not directly related)	Data not available in the input.
`87803`	Infectious agent detection by microscopy (e.g., parasite)	Used when smear review detects parasites and additional organism-specific microscopy or confirmatory testing is required.

Related Codes

CPT-85002-BLEEDING-TIME-TEST-LABORATORY

CPT 85002: Bleeding Time Test, Laboratory

CPT-85004-AUTOMATED-DIFFERENTIAL-WHITE-BLOOD-CELL-COUNT

CPT 85004: Automated Differential White Blood Cell Count

CPT-85007-MANUAL-DIFFERENTIAL-WHITE-BLOOD-CELL-COUNT

CPT 85007: Manual Differential White Blood Cell Count

CPT-85009-MANUAL-WBC-COUNT-BUFFY-COAT

CPT 85009: Manual White Blood Cell Count Using Buffy Coat

CPT-85013-MICROHEMATOCRIT-TEST-LABORATORY-DIAGNOSTIC

CPT 85013: Microhematocrit Test, Laboratory Diagnostic

CPT-85014-HEMATOCRIT-VOLUME-PERCENT-RED-BLOOD-CELLS

CPT 85014: Hematocrit (Volume Percent of Red Blood Cells)

CPT-85018-HEMOGLOBIN-ASSAY-WHOLE-BLOOD

CPT 85018: Hemoglobin Measurement in Whole Blood

CPT-85025-COMPLETE-BLOOD-COUNT-CBC

CPT 85025: Complete Blood Count (CBC)

CPT-85027-COMPLETE-BLOOD-COUNT-HGB-HCT

CPT 85027: Complete Blood Count with Hemoglobin and Hematocrit

CPT-85032-MANUAL-DIFFERENTIAL-BLOOD-SMEAR-COUNT

CPT 85032: Manual Differential White Blood Cell Count

Showing 1–10 of 99

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`00`	Default/No modifier	Use when no specific modifier applies to the service.
`26`	Professional component	Use when reporting only the professional component for analysis performed by the laboratory professional separate from the technical component.
`TC`	Technical component	Use when reporting only the technical component (laboratory preparation and microscopy without professional interpretation) if split billing is allowed.
`59`	Distinct procedural service	Use when the smear review is distinct from other services provided on the same day (for example, separate from a formal differential or morphology procedure).
`76`	Repeat procedure by same provider	Use if the laboratory analyst repeats the slide review during the same encounter for quality or confirmatory review.
`77`	Repeat procedure by another provider (Note: `77` is not in raw list; not used)	Data not available in the input.
`90`	Reference (outside) laboratory	Use when the slide was examined by an outside reference lab and the billing reflects that vendor service.
`91`	Repeat clinical lab test	Use when a repeat microscopic review is performed for verification of prior abnormal results.
`52`	Reduced services	Use when the procedure is partially reduced or not fully performed for clinical reasons.
`53`	Discontinued procedure	Use when the slide review was started but discontinued for documented clinical reasons.
`59`	Distinct procedural service	Use when the smear examination is separately identifiable from other lab tests on the same day.
`QK`	Ordering/Referring Physician Certification and Documentation on File	Use when required documentation for lab ordering is present per payer rules.

Taxonomy Code	Specialty	Notes
2085P0201X	Hematology	Hematologists frequently order and interpret peripheral smear findings and may review slides.
207RH0000X	Pathology	Pathologists and hematopathologists provide diagnostic review and final interpretation when abnormal or complex findings are present.
391200000X	Clinical Laboratory	Medical laboratory technologists and clinical laboratory scientists perform slide preparation and microscopy.
204SP0800X	Family Medicine	Ordering providers in primary care often request screening peripheral smear reviews for anemia or abnormal CBC.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
Data not available in the input.	Data not available in the input.	Data not available in the input.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`85025`	Automated white blood cell (WBC) differential count, including automated platelet count when performed	Performed when a formal differential count is required after a smear review suggests abnormal WBC distribution; may follow or be ordered concurrently.
`85027`	Automated reticulocyte count	Used when smear review suggests hemolysis or altered erythropoiesis prompting reticulocyte quantification.
`85379`	Peripheral blood smear, review by a physician or other qualified health care professional	Performed when a more detailed microscopic review and formal interpretation by a pathologist or hematologist is required beyond the lab analyst's basic exam.
`86580`	Skin test interpretation (not directly related)	Data not available in the input.
`87803`	Infectious agent detection by microscopy (e.g., parasite)	Used when smear review detects parasites and additional organism-specific microscopy or confirmatory testing is required.

Related Codes

CPT-85002-BLEEDING-TIME-TEST-LABORATORY

CPT 85002: Bleeding Time Test, Laboratory

CPT-85004-AUTOMATED-DIFFERENTIAL-WHITE-BLOOD-CELL-COUNT

CPT 85004: Automated Differential White Blood Cell Count

CPT-85007-MANUAL-DIFFERENTIAL-WHITE-BLOOD-CELL-COUNT

CPT 85007: Manual Differential White Blood Cell Count

CPT-85009-MANUAL-WBC-COUNT-BUFFY-COAT

CPT 85009: Manual White Blood Cell Count Using Buffy Coat

CPT-85013-MICROHEMATOCRIT-TEST-LABORATORY-DIAGNOSTIC

CPT 85013: Microhematocrit Test, Laboratory Diagnostic

CPT-85014-HEMATOCRIT-VOLUME-PERCENT-RED-BLOOD-CELLS

CPT 85014: Hematocrit (Volume Percent of Red Blood Cells)

CPT-85018-HEMOGLOBIN-ASSAY-WHOLE-BLOOD

CPT 85018: Hemoglobin Measurement in Whole Blood

CPT-85025-COMPLETE-BLOOD-COUNT-CBC

CPT 85025: Complete Blood Count (CBC)

CPT-85027-COMPLETE-BLOOD-COUNT-HGB-HCT

CPT 85027: Complete Blood Count with Hemoglobin and Hematocrit

CPT-85032-MANUAL-DIFFERENTIAL-BLOOD-SMEAR-COUNT

CPT 85032: Manual Differential White Blood Cell Count

Showing 1–10 of 99

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

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CPT 85008: Blood Smear Morphologic Review Without Differential

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Billing Code Overview

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CPT 85008: Blood Smear Morphologic Review Without Differential

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References