CPT code 86900: Blood typing, serologic; ABO billing guide

CPT code 86900 is the billing code for blood typing, serologic; ABO. It reports a laboratory test that identifies a patient’s ABO blood group by serologic method. The code sits in the Transfusion Medicine subsection (86850-86999) of the AMA’s Pathology and Laboratory section.

Medicare prices 86900 on the Clinical Laboratory Fee Schedule, so one national amount applies wherever the test runs. Rh typing carries its own code, 86901, and the two usually appear on the same claim. Most denials on 86900 trace back to the diagnosis code rather than the test.

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Key takeaways

CPT code 86900 describes serologic ABO blood typing, which is separate from Rh typing under CPT 86901.

Medicare prices 86900 on the Clinical Laboratory Fee Schedule, a single national amount with no facility split and no geographic adjustment.

86900 and 86901 are usually billed together but are not bundled under NCCI edits, so each needs its own claim line.

Pabau’s claims management software runs background validation checks and real-time eligibility before a claim leaves the practice.

CPT code 86900: Blood typing, serologic; ABO

CPT code 86900 is a laboratory procedure code that reports serologic ABO blood group determination. The AMA’s official long descriptor reads: “Blood typing, serologic; ABO.” According to the AMA’s CPT code set overview, the Transfusion Medicine subsection covers the laboratory testing that supports safe blood administration.

The code is reported per specimen tested, so each patient sample counts as one reportable unit. It does not include Rh(D) typing, which is coded separately under CPT 86901. Most blood bank orders cover both, so both codes appear on the same claim.

When to use CPT code 86900: Clinical indications

Blood group typing is indicated any time a clinician needs a patient’s ABO status before an event that carries transfusion risk. The three dominant scenarios are pre-transfusion workup, pre-surgical preparation, and prenatal screening.

• Pre-transfusion workup: Any patient requiring a blood transfusion must have ABO and Rh typing performed before compatible units are issued. Blood banks run 86900 as part of the type-and-screen or type-and-crossmatch order.
• Pre-surgical preparation: Elective and emergency surgical cases with anticipated blood loss require pre-operative blood typing. Surgical coordinators and hospital billers submit 86900 as part of the pre-op laboratory panel.
• Prenatal screening: Obstetric guidelines call for ABO and Rh typing at the first prenatal visit. If the mother is Rh-negative, repeat typing may be ordered later in pregnancy. CPT 86900 is reported for each distinct specimen date.
• Emergency medicine: Trauma patients and those presenting with active hemorrhage receive emergency type-and-screen orders. In this setting, 86900 is ordered as a STAT laboratory test with turnaround measured in minutes.
• Blood donor screening: Blood banks and collection centers report 86900 when typing donated units before they enter the inventory.

Medical necessity documentation must reflect one of these established clinical indications. Ordering ABO typing without a documented clinical reason is the most direct path to a claim denial.

CPT code 86900 fee schedule and Medicare reimbursement (2026)

Medicare prices CPT code 86900 under the Clinical Laboratory Fee Schedule (CLFS), not the Physician Fee Schedule. That distinction decides how the rate is read. The CLFS carries one national amount per code, and 86900 sits in the lowest reimbursement tier of the laboratory codes.

Plenty of published references quote a Physician Fee Schedule figure for 86900, split into facility and non-facility rates. Neither number applies here. Since the 2018 CLFS overhaul the schedule has carried no site-of-service differential and no GPCI locality adjustment, so the amount does not move by region.

Read the current figure from CMS’s published CLFS files rather than the MPFS lookup tool. The Clinical Laboratory Fee Schedule page carries the annual rate file and the quarterly updates.

Commercial payers set their own laboratory rates and are not bound by the CLFS. Reading the remittance advice after each payment cycle is the fastest way to catch a rate that has drifted from the contract.

Medicare coverage and payer policies

Medicare covers CPT 86900 when the test is performed for an established clinical reason tied to an active diagnosis. Coverage runs through contractor-level Local Coverage Determinations rather than a single National Coverage Determination. The policy that applies depends on the MAC jurisdiction where the claim is filed.

Commercial payer rates vary widely. Some payers fold ABO typing into a broader panel fee. Others reimburse it as a standalone line item, so verify the patient’s plan contract before billing.

Related CPT codes: 86901 and the transfusion medicine panel

CPT code 86901 (blood typing, serologic; Rh(D)) is the companion code billed alongside 86900 in nearly every transfusion medicine and prenatal workup. 86900 captures the ABO determination and 86901 captures the Rh factor result. They are distinct codes for distinct analytes, billed on separate lines on the same date of service. Where the workup ends in a transfusion, the administration itself is billed under 36430.

Bundling rules and NCCI edits for CPT 86900

CPT codes 86900 and 86901 are not subject to a mutual exclusion NCCI edit when billed on the same date. Each describes a distinct serologic test, so both belong on the claim when both tests were run. Billing only 86900 when both were performed costs the practice the 86901 payment.

Bundling problems arise instead with panel codes that already include ABO typing. Three checks, run in order, settle how many lines one ABO typing order becomes.

• Panel inclusion check: If the ordering provider uses a defined laboratory panel code that already incorporates ABO typing, billing 86900 separately is an unbundling violation. Confirm whether the panel descriptor includes the ABO component before adding a standalone 86900 line.
• Same specimen, same date: A repeat of 86900 on the same date for the same patient needs a distinct clinical indication in the record. A discrepant typing result or a new specimen collection event both qualify.
• Payer-specific NCCI edit tables: Some commercial payers apply their own bundling edits beyond the CMS NCCI table. Check the applicable payer’s current edit table, particularly for Medicaid managed care contracts.

ICD-10-CM codes commonly linked to CPT 86900

Pairing CPT code 86900 with the correct ICD-10-CM diagnosis code is what supports medical necessity on the claim. The Z67 series records blood type status as an encounter reason. Pregnancy and pre-op codes apply when typing is ordered in those contexts.

Check each code against the FY2026 tabular list before it goes on a claim, or against our ICD-10-CM code reference. The AAPC CPT-to-ICD-10 crosswalk is a quick way to confirm that a pairing is still valid.

Select the most specific code available. Reporting Z67.90 when the chart already records the patient’s blood type is a documentation defect that invites scrutiny during a payer audit.

Documentation requirements for billing CPT 86900

Meeting the documentation threshold for CPT 86900 is straightforward, but it has to be applied consistently. Missing elements are the most common trigger for medical necessity denials on laboratory claims. The medical record must include all of the following:

• Ordering provider identity: The physician or qualified non-physician practitioner ordering the test must be identified by name and NPI. Blanket orders from an unnamed covering provider create an audit liability.
• Medical necessity statement: The order or clinical note must document why ABO typing is clinically necessary for this encounter. A single-line notation (“ABO typing pre-op” tied to the surgical order) is sufficient in most cases.
• Specimen details: Date of specimen collection, specimen type (typically whole blood or serum), and collection method must appear in the laboratory record.
• Test result: The finalized result (for example, “Blood type: A, Rh positive”) must be documented in the patient record. Billing for a test with no documented result invites a retro-denial during audit.
• Linked diagnosis code: The ICD-10-CM code reported on the claim must match the clinical reason documented in the chart. A pre-op typing order needs a pre-procedural encounter code, not a general wellness code.

Capturing these fields at the point of order entry, on a structured superbill, cuts the volume of records requests that arrive after submission.

Billing guidelines and common coding errors

CPT code 86900 billing guidelines cover place of service selection, modifier use, and per-specimen reporting. Getting any one of them wrong is enough to trigger a denial or a payment reduction.

Place of service and modifier usage

The place of service (POS) code tells the payer where the test was performed. POS 11 identifies a physician office, POS 22 an outpatient hospital, and POS 21 an inpatient hospital. Billing POS 11 for a test run in a hospital-based laboratory is a mismatch that payers catch during claim review.

Modifiers are rarely required on a standalone 86900 claim. Modifier 91 applies when 86900 is billed more than once on the same date for the same patient and the repeat is clinically justified. Do not reach for modifier 59 to override a bundling edit without confirming the edit and its bypass criteria with your MAC.

Common billing errors and how to avoid them

The claim defects below come from recurring patterns in transfusion medicine billing audits. Each one has a resolution that takes minutes when it is caught before the claim goes out.

• Missing or wrong ICD-10 code: Submitting 86900 with a diagnosis that does not support blood typing triggers a medical necessity denial. Resolution: Append the correct Z67 or encounter-specific ICD-10 code and refile a corrected claim.
• Billing 86900 without 86901: When both tests were performed and only 86900 is billed, the practice loses the 86901 payment. Resolution: Review laboratory order confirmations against the claim and add 86901 where it appears in the report.
• Unbundling from a panel: Some hospital laboratory panels include ABO typing in the global fee. Billing 86900 separately inflates the claim. Resolution: Verify the panel descriptor against the CPT codebook before adding standalone lines.
• Incorrect rendering provider NPI: For independent laboratory billing under CLIA, the rendering provider field must carry the NPI of the performing laboratory. Resolution: Confirm that the rendering NPI maps to the licensed laboratory entity, not the referring physician.
• Late filing: Medicare requires claims within 12 months of the date of service. Prenatal typing claims from the previous year that fall outside this window are denied with no appeal recourse. Resolution: Flag any laboratory claim older than 9 months for expedited processing.

How claims management software reduces denials on CPT 86900

A single ABO typing order leaves four records behind, and the claim has to agree with all of them:

• The ordering provider’s identity and NPI
• The laboratory that ran the test, and its rendering NPI
• The ICD-10-CM code that justifies the order
• The companion 86901 line, where Rh typing was performed

In most setups each of those is keyed by hand into a separate system. One mismatch between the order and the claim is enough to trigger a medical necessity denial weeks later.

Pabau is an all-in-one practice management system. Its claims software for practices keeps the order, the result and the claim in one patient record. Background validation checks run over a claim before it leaves the practice, so obvious defects surface while the biller still has the file open.

Claims route to payers through the Claim.MD clearinghouse, which returns real-time eligibility for thousands of payers. Confirming coverage before submission removes the inactive-coverage denials that a manual workflow only discovers on the remittance.

The 837P file Pabau generates carries the fields a laboratory claim needs, including the rendering provider NPI, the place of service, and the specimen date. Getting those right on the first pass is what shortens the payment cycle on high-volume laboratory codes.

Send cleaner transfusion medicine claims

Pabau keeps the order, the diagnosis code and the claim in one patient record. Background validation checks and real-time eligibility run before submission, so your 86900 and 86901 lines go out complete.

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Conclusion

Billing CPT code 86900 accurately comes down to three habits. Pair the code with a diagnosis that matches the documented reason for the order. Add 86901 whenever Rh typing was performed, and keep the finalized result in the chart where an auditor can find it.

The code itself is simple. The money goes missing in the workflow around it. An order, a result and a claim get keyed into three systems that never compare notes.

Catching a defect before submission is worth more than appealing it afterwards, because a laboratory line rarely pays back the labor an appeal costs. Book a demo to see how Pabau handles laboratory claims inside the patient record.

Continue your research

Need to understand the full claims submission process? What is medical billing covers the end-to-end workflow from patient encounter to payment posting.

Concerned about claim denial patterns across your lab codes? Denial codes in medical billing provides a reference for reading and responding to payer rejection reasons.

Want to understand how clearinghouses validate your claims? Medical claims clearinghouse guide explains how payers, clearinghouses, and providers exchange claim data.

Wondering how the specimen collection itself is billed? CPT code 36415 covers routine venipuncture, the draw that produces the specimen 86900 is run on.

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