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    OpenPayerBilling CodesDiagnostic Nuclear Medicine Procedures on the Hematopoietic, Reticuloendothelial and Lymphatic SystemCPT cpt-78122-whole-blood-volume-study-isotope-dilution
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    CPT 78122: Whole Blood Volume Study by Isotope Dilution

    Medicare pays $70 on average nationally for this procedure.

    CPT code 78122 describes a whole blood volume study that measures total blood, red blood cell, and plasma volumes using an isotope dilution technique in which a radiopharmaceutical or radiotracer and the patient’s labeled red blood cells are injected and concentrations are measured after mixing; this is a diagnostic nuclear medicine test typically performed in an outpatient imaging center, hospital nuclear medicine department, or specialized radiology clinic where isotope handling and blood labeling are available.

    For related coverage guidance, see recent payer policy updates: Vafseo (vadadustat) for anemia in CKD on dialysis, Metabolic Disorders - Cysteamine (Oral) Products for Individual and Family Plans, Kerendia (finerenone) — Coverage Criteria.

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    Clinical & Coding Specifications

    Clinical Context

    A 58-year-old patient with congestive heart failure and unexplained anemia is referred for measurement of whole blood volume to differentiate true anemia from plasma volume expansion. The nuclear medicine team schedules a quantitative blood volume study using isotope dilution. The procedure involves withdrawing a baseline blood sample, labeling the patient’s red blood cells with a radiotracer (commonly technetium-99m), reinjecting the tagged cells and a known quantity of radiopharmaceutical, then obtaining timed blood samples and counting radioactivity to calculate red blood cell and plasma volumes. The workflow includes pre-procedure consent and allergy review, venous access placement, baseline vital signs, specimen labeling, radiopharmacy preparation of tracer, in-procedure blood draws at specified intervals, laboratory/radiation counts, calculation of total blood, red cell and plasma volumes, documentation of results and interpretation by a nuclear medicine physician, and communication of results to the referring hematologist or cardiologist. Typical site of service is an outpatient nuclear medicine or hospital-based imaging department with capability for radiopharmaceutical handling and inpatient bed availability when clinically indicated.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    78200Preparation and administration of radiopharmaceutical; diagnostic, single studyOften performed prior to or as part of nuclear medicine workflows when preparing/administering tracers used in blood volume studies.
    78280Multiple point blood sampling, radioassay; blood volume studyDirectly related technique code representing sampling and radioassay steps used to calculate volumes (often billed in conjunction when applicable).
    36591Collection of blood from indwelling catheter, any methodUsed when blood samples for the isotope dilution are drawn from an existing central venous catheter instead of peripheral sticks.
    36510Insertion of non-tunneled centrally inserted central venous catheter, age 5 years or olderMay be performed if central access is required for multiple timed blood draws in inpatients.
    93000Electrocardiogram, routine ECG with interpretation and reportPre-procedure monitoring or baseline assessment in patients with cardiac disease undergoing the study may include ECG documentation.

    Related Modifiers

    13 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    80CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…

    Showing 1–10 of 13

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RC0000X
    207L00000X
    2084N0400X
    1223D0001X
    163WS0200X
    3336N0007X
    2472D0500X
    133NN1002X

    Related Payer Policy Updates

    Specialty: Nephrology1 / 2

    10 rows

    PolicyPayerEffective Date
    Vafseo (vadadustat) for anemia in CKD on dialysisCigna2026-08-15
    Metabolic Disorders - Cysteamine (Oral) Products for Individual and Family PlansCigna2026-08-15
    Kerendia (finerenone) — Coverage CriteriaBlue Cross Blue Shield - Iowa2026-08-05
    Voyxact (sibeprenlimab-szsl) — Prior authorization / medical necessity for primary IgA nephropathyColorado Rocky Mountain Health Plans2026-08-01
    Oxlumo (lumasiran) and Rivfloza (nedosiran) — Coverage Criteria (Ohio)Colorado Rocky Mountain Health Plans2026-08-01
    Korsuva (difelikefalin) — Medical Benefit Drug Coverage Criteria (Ohio)Colorado Rocky Mountain Health Plans2026-08-01
    Complement Inhibitors - EmpaveliCigna2026-08-01
    Tolvaptan (Jynarque)Cigna2026-08-01
    Nephrology - Filspari (sparsentan) coverageCigna2026-08-01
    Rivfloza (nedosiran) prior authorization for PH1UnitedHealthcare2026-08-01

    Related Codes

    CPT-78102-LIMITED-AREA-BONE-IMAGING-NUCLEAR-MEDICINE

    CPT 78102: Limited-Area Bone Imaging (Nuclear Medicine)

    CPT-78103-NUCLEAR-MEDICINE-BONE-SCAN

    CPT 78103: Multisite Bone Scintigraphy (Nuclear Medicine)

    CPT-78104-WHOLE-BODY-BONE-SCAN

    CPT 78104: Whole-Body Radionuclide Skeletal Scan

    CPT-78110-SINGLE-SAMPLE-PLASMA-VOLUME-DETERMINATION

    CPT 78110: Single-Sample Radioisotope Plasma Volume Determination

    CPT-78111-PLASMA-VOLUME-MULTIPLE-SAMPLE-METHOD

    CPT 78111: Plasma Volume Determination, Multiple Sample Method

    CPT-78120-RADIOLABELED-SINGLE-SAMPLE-RED-CELL-VOLUME

    CPT 78120: Single-Sample Radioisotope Red Cell Volume Determination

    CPT-78121-RED-CELL-VOLUME-MULTIPLE-SAMPLE-METHOD

    CPT 78121: Red Cell Volume by Multiple-Sample Radioisotope Method

    CPT-78130-RED-BLOOD-CELL-SURVIVAL-STUDY-AUTOLOGOUS-RADIOLABEL

    CPT 78130: Red Blood Cell Lifespan Study, Radiolabeled Autologous RBC

    CPT-78140-LIVER-SPLEEN-RADIOLABELED-RED-BLOOD-CELL-SCAN

    CPT 78140: Liver and Spleen Scan with Radiolabeled Red Blood Cells

    CPT-78185-SPLEEN-RADIONUCLIDE-SCAN-SPLENIC-IMAGING

    CPT 78185: Radionuclide Spleen Study for Size/Position and Lesion Detection

    Showing 1–10 of 13

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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