CPT code 83695 – Lipoprotein(a) assay billing and coverage

Key takeaways

CPT code 83695 reports a quantitative Lp(a) assay, a genetically determined risk marker that a lipid panel does not measure.

Medicare covers CPT 83695 under CMS Article A57055 when a supporting ICD-10 diagnosis documents cardiovascular risk, though MAC policies vary.

The most common denial reasons are missing medical necessity documentation, ICD-10 code mismatches, and frequency limit violations, each correctable with the right appeal documentation.

Practice management software like Pabau submits CPT 83695 claims through Claim.MD and checks each one for missing fields before it goes out.

What is CPT code 83695?

CPT code 83695 is the procedure code for a quantitative assay of Lipoprotein(a), or Lp(a). Lp(a) is a lipid particle carrying an atherogenic apolipoprotein, and it raises cardiovascular disease risk independently of LDL cholesterol.

The American Medical Association (AMA), which maintains the CPT code set, files 83695 under Chemistry Procedures in the Pathology and Laboratory section. The code covers the measurement service only, not the physician’s interpretation or report.

Lp(a) levels are genetically determined. Roughly 20-25% of the population carries an elevated level, and neither diet nor statins reliably lower it. That drives ordering volume, and it is why payers look closely at medical necessity.

Official code descriptor and category

The table below carries the classification data for 83695 as published by the AMA and referenced by the American Academy of Professional Coders (AAPC). Use it when checking the code against your billing system or superbill template.

Documentation requirements before you bill

To establish medical necessity, the ordering provider documents four elements before the claim reaches the clearinghouse. Incomplete documentation is the single largest source of avoidable denials on this code, so check these against your pre-authorization workflow.

• Clinical indication: A documented cardiovascular risk condition or family history that makes Lp(a) testing medically necessary. A clinical note referencing the ordering rationale is not optional.
• Supporting ICD-10 codes: At least one accepted diagnosis code must appear on the claim. It has to match what the patient record says, and the next section lists the usual pairings.
• Ordering provider credentials: The test must be ordered by a licensed provider with authority to order clinical laboratory tests. Some payer policies restrict lab orders to MDs, DOs, or NPs depending on state scope-of-practice rules.
• Specimen handling notes: Serum or plasma, collected by standard venipuncture. No special patient preparation is needed, but the specimen type is documented in case the claim is audited.

For practices ordering Lp(a) routinely, a standing order template that pre-populates these four fields cuts per-claim rework.

ICD-10 diagnosis codes that support the claim

Payers check medical necessity by matching the ICD-10 code on the claim against their coverage policy. The codes below are commonly accepted, which is not the same as guaranteed coverage, since policies vary by plan and jurisdiction. Verify against the specific MAC LCD or commercial payer policy before submission.

E78.01 (familial hypercholesterolemia) and I25.10 (atherosclerotic heart disease) give the strongest medical necessity footing. In both conditions, an elevated Lp(a) result changes what the clinician does next.

Medicare and payer coverage

Medicare covers CPT 83695 under CMS Article A57055, which addresses biomarkers used in cardiovascular risk assessment. Coverage is conditional. The claim has to carry an accepted diagnosis code, and the MAC’s LCD for that jurisdiction must not exclude the service.

Check your MAC’s current LCD before billing, because coverage articles change between annual fee schedule cycles.

No payer covers Lp(a) testing on demand or as part of a routine wellness panel. Every policy reviewed here requires a clinical indication in the medical record before the claim is processed. Plan-level variation runs wide enough that a blanket assumption about any national brand will cost you claims.

Prior authorization requirements

Medicare generally does not require prior authorization for clinical laboratory tests, 83695 included. MACs can impose LCD restrictions that work like coverage criteria, but no pre-authorization submission is normally needed for Medicare lab claims.

Commercial payers behave differently. Aetna, UHC and some BCBS plans require authorization for cardiovascular biomarker panels, depending on the plan and the market. Running insurance eligibility verification before the order is the practical first step, since the response often flags whether PA applies to lab services.

When authorization is required, the payer typically wants three things. Expect the cardiovascular history or risk factor documentation, the relevant ICD-10 codes, and the ordering provider’s rationale. Turnaround at commercial payers runs 1 to 5 business days.

Medicare reimbursement and the clinical lab fee schedule

CPT 83695 is paid under the Medicare Clinical Laboratory Fee Schedule (CLFS), which CMS updates annually and sets at nationally uniform rates. Unlike the Physician Fee Schedule, CLFS rates do not vary by geography. Look up the current rate for 83695 in the CMS clinical laboratory fee schedule files before you quote a figure to a patient.

Reference labs bill most 83695 volume directly, so the CLFS rate is often the practice’s benchmark rather than its receipt. Check which entity holds the payer contract before you forecast revenue on this code.

Codes commonly confused with 83695

Lp(a) charges get misfiled under adjacent lipoprotein codes or folded into a lipid panel. The table below sets out the distinctions and flags same-day billing eligibility.

Billing rules, NCCI edits, and bundling

CPT 83695 is a standalone laboratory code with no column-one/column-two NCCI edit pair bundling it into a lipid panel. Because Lp(a) is not a component of CPT 80061, billing both on the same date of service follows the clinical logic and is generally permitted.

Each service still needs its own medical necessity documentation, since one ICD-10 code supporting the lipid panel does not justify the Lp(a) assay. Place of service matters too.

CPT 83695 is usually performed at a reference laboratory such as Quest Diagnostics or Labcorp, and billed by the performing lab under POS 81. Where the ordering physician’s office runs its own chemistry, POS 11 may apply instead.

The wrong POS can trigger a claim edit even when the code and diagnosis are right. A practice that bills its own lab work can set the POS rule at order entry inside claims software for labs.

• Modifier 59: May apply when 83695 is billed with another code in the same general category, to signal a distinct procedural service. Check the current NCCI edit tables before applying, since edits update quarterly.
• Ordering vs. performing provider: The performing laboratory bills 83695. An ordering physician may bill a separate evaluation and management code for the encounter that generated the order, but not the lab code as well.
• Frequency limits: Some commercial payers and BCBS plans cap Lp(a) testing at one or two tests a year. Claims beyond that cap come back as a CO-119 denial.

Frequency caps and POS rules are payer-level settings rather than code-level ones. A rule built into the order workflow catches both before the claim is generated.

Why CPT 83695 claims get denied

Most 83695 denials fall into four categories, each with its own CARC code and corrective action. Tracking them by denial codes stops the same pattern repeating across patient accounts.

Read the four backwards and they become a pre-submission checklist. Each check below is set before the claim is built, and each one that slips returns its own code.

How to appeal a denied CPT 83695 claim

Appeals succeed when the clinical record does the arguing. An appeal letter with no supporting documentation rarely reverses a CO-50 or CO-4 denial.

1. Pull the EOB or ERA to confirm the exact denial reason code. A CO-50 (medical necessity) and a CO-4 (diagnosis code mismatch) need different documentation packages.
2. Locate the applicable LCD, NCD, or commercial CPB. For Medicare, check CMS Article A57055 and your MAC’s current LCD. For commercial payers, use the CPB number from the denial EOB.
3. Compile the clinical documentation. Include the ordering note, problem list entries showing the cardiovascular indication, and any prior results supporting why Lp(a) testing was necessary.
4. Draft the appeal against the payer’s own policy language. Quote the covered indication that applies to this patient, since generic appeal letters without policy citations get deprioritized.
5. Submit within the timely filing window. Medicare redetermination is 120 days from the remittance date, and commercial payers typically allow 60 to 180 days. Confirm the deadline on the denial EOB.

How Pabau keeps 83695 orders and claims in step

An 83695 problem usually surfaces after the remittance arrives, weeks after the specimen went out, with a CARC code attached. By then the ordering note is fixed and the appeal window is running.

Pabau keeps the order, the diagnosis code and the claim on one patient record. The ordering provider’s note, the ICD-10 pairing and the charge are entered once, so the claim carries what the payer asked for.

Claims then go out through our Claim.MD integration, which routes them to thousands of US insurance payers and flags incomplete fields before submission. Denials that do come back land against the same record, so building the appeal packet means filtering a list rather than hunting through files.

Stop losing Lp(a) claims to avoidable denials

Pabau submits CPT 83695 claims through Claim.MD to thousands of US insurance payers. Each claim is checked for missing fields before it leaves the practice.

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Conclusion

Code selection is rarely what sinks an 83695 claim. The order note and the diagnosis code decide it, and both are set before the specimen ever reaches the lab.

So the work that pays off sits upstream. Fix the ordering template once, review your MAC’s LCD each quarter, and the denial rate on this code looks after itself.

Pabau connects to Claim.MD to send 83695 claims to thousands of US insurance payers, checking each one for missing fields first. Book a demo to see how it handles cardiovascular lab billing.

Continue your research

Need a framework for handling claim rejections systematically? Denial management in healthcare covers a structured workflow for categorizing, tracking, and resolving denied claims across all payer types.

Want to understand how the clearinghouse fits into your revenue cycle? Medical claims clearinghouse guide explains how electronic claim routing and payer edits work between practice and payer.

Looking for guidance on superbill setup for lab codes? Superbill best practices covers how to structure charge capture documents for CPT and ICD-10 pairings that pass payer review.

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