Laboratory Billing Services for Clinical, Toxicology and Molecular Labs
Labs bill under conditions most practices never face. You rarely see the patient, you rely on another office for the diagnosis codes, and you may run a high volume of low-dollar tests next to a handful of expensive ones. A requisition without an ICD-10 code, a panel billed when one component wasn’t run, or a molecular test missing its registration can each hold up payment. Independent and physician office labs use our laboratory billing services to fix claims at the requisition stage and to follow up on the ones payers push back on.
Why lab claims get stuck
Requisitions and orders
Every test needs a valid order from a treating practitioner, showing the ordering provider's name and NPI, the tests ordered and the diagnosis codes that support them. The lab can't infer a diagnosis, so an incomplete requisition means going back to the ordering office. Without a set routine for that, specimens turn into unbilled revenue.
Medical necessity and ABNs
NCDs and LCDs list the diagnoses that support coverage for many common tests and set frequency limits. When a Medicare test may not be covered, the ABN has to be signed before the specimen is collected, and the claim needs GA, or GZ when no ABN is on file. Commercial plans write their own policies, and many hand lab management to a benefit manager.
CLIA
Your CLIA certificate has to cover the complexity of every test you bill, and the number goes on the claim. Medicare also expects QW on many waived tests. A lapsed certificate or a test outside its scope can deny an entire batch at once.
Panels, bundling and repeats
Organ and disease panels, like the comprehensive metabolic panel, can be billed only when every component was performed; otherwise the tests are billed individually. NCCI edits and MUEs cap code pairs and units. Modifier 91 is only for medically necessary same-day repeats, 59 and the X modifiers need real distinctness, and some payers want modifier 90 for reference lab work.
Toxicology
Presumptive screens (80305 to 80307) and definitive testing are coded differently. Medicare uses G0480 to G0483 for definitive testing, while other payers may use 80320 to 80377. Payers expect patient-specific reasons for definitive testing and audit tox billing closely.
Molecular and genetic testing
Many molecular tests use Tier 1 or Tier 2 codes, PLA codes or unlisted codes. In MolDX jurisdictions, tests generally need registration and the identifier on the claim. Commercial plans often require prior authorization through a lab benefit manager before the test is run.
Date of service, client bills and statements
Specimens from hospital patients can fall under Medicare date-of-service rules that decide whether the hospital or the lab bills. Some tests go to a client account, such as a physician practice or facility, instead of insurance. Patient statements need to say clearly who the lab is, since patients often won't recognize the name.
Our Services
How Salyx RCM helps laboratories
Requisition review
Our intake and eligibility team checks demographics, insurance and order completeness as requisitions arrive, and runs a set process for requesting missing diagnoses or signatures from ordering offices.
Prior authorization
Molecular, genetic and other tests that need approval are requested and tracked, including through lab benefit managers.
Coding and edits
CPT and HCPCS codes, panel rules, modifiers such as QW, 91 and 90, NCCI and MUE edits, and NCD/LCD diagnosis checks are handled by the certified coders on our coding staff.
Claim submission
As part of claim submission, client-billed tests are separated out, and every insurance claim carries the CLIA number, ordering provider details and any required test identifiers.
Payment posting
High-volume remittances are posted line by line, and payments below the fee schedule or contracted rate are flagged.
Denial follow-up
Our denial management work covers medical necessity, frequency, missing-information and authorization denials, including requests for ordering-provider records when an appeal needs them.
Credentialing
The lab and its directors are enrolled with Medicare, Medicaid and commercial plans.
Patient statements
Each patient statement names the ordering provider and the test date, so patients recognize the charge.
Reporting
Reports cover unbilled specimens, denials by reason and by ordering client, and AR by payer.
Your LIS and billing system
We work in lab systems like LigoLab, Orchard and XiFin, and others, so requisitions, results and claims stay in the platform your lab already runs. Patient and specimen data is handled under HIPAA-compliant processes.
How It Works
Our process
1. Discovery call
We review your test menu, ordering clients, payer mix and LIS or billing system.
2. Edit and policy setup
Coverage policies, panel rules and payer requirements for your highest-volume and highest-value tests are documented.
3. Onboarding
We sign a Business Associate Agreement with the lab. Your client services team then gets a missing-information workflow, and we get secure access to the LIS and billing system.
4. Daily operations
Requisition checks, coding, claims, posting and follow-up are worked on a set schedule.
5. Client-level review
Denial trends are broken out by ordering client so the requisition problems behind them can be fixed at the source.
Related reading
Claim checkpoints
What happens to a medical claim in the seven minutes before it gets denied walks through where denials start.
Payer follow-up
Many lab claims need a second touch. Read why some insurance follow-ups get faster answers.
After-hours work
How time zone coverage supports US healthcare operations explains what can get done while your lab is closed.
Frequently Asked Questions
Questions lab owners and managers bring up most.
1. What do you do when a requisition is missing a diagnosis code?
It goes into a missing-information queue, and we ask the ordering provider’s office for the diagnosis or documentation. We never assign a diagnosis the ordering provider didn’t document.
2. Do you bill toxicology testing?
Yes. Presumptive and definitive drug testing are billed with the codes each payer requires, and we check that the order and documentation support the level of testing.
3. Can you help with molecular test registration and prior authorization?
We can help gather and submit what payers and programs like MolDX ask for, request and track prior authorizations through lab benefit managers, and report the required identifiers on claims.
4. How do you handle Medicare medical necessity for lab tests?
Diagnosis codes are checked against the applicable NCDs and LCDs before billing, frequency limits are applied, and ABN modifiers are used correctly when a signed ABN is on file.
5. Do you handle client billing as well as insurance billing?
Yes. Client-billed tests can be separated from third-party claims and invoiced according to your agreements with those clients.
Other specialties we serve
Salyx RCM also handles billing for these related specialties.
Multi-Specialty Billing
E/M leveling, modifiers and global surgery across departments.
Sleep Lab Billing
Study codes, home sleep tests and CPAP coverage rules.
Infusion Billing
Drug units, NDCs, JW and JZ modifiers and administration codes.
Behavioral Health Billing
Therapy time codes, telehealth, authorizations and carve-out plans.
Get a second look at your lab claims
Missing requisition data, medical necessity edits and tox or molecular denials can all be fixed, but the fix starts with knowing which clients and tests are behind them. We’ll go through that with you in a free consultation. You can reach us at (321) 788-3655 or info@salyxrcm.com.