Missing DEX Z-code
MolDX contractors deny tests without the registered Z-code.
How we prevent it: We register tests and attach Z-codes to every claim that needs them.
MOLECULAR LAB BILLING
Molecular Lab Billing Services
Molecular and genetic testing claims require precise CPT and PLA coding, payer-specific coverage policies and often prior authorization.
No upfront feesHIPAA-compliantSpecialty-trained coders
$0
Upfront or setup fees
0
Revenue cycle steps managed end to end
0
Specialties and lab types we bill for
0
Of your data and systems stay yours
OVERVIEW
Molecular Lab billing done right
Molecular and genetic testing claims require precise CPT and PLA coding. Tests may have their own Tier 1 or Tier 2 codes, a proprietary laboratory analysis (PLA) code or no specific code at all.
In MolDX jurisdictions, many tests need a technical assessment and a DEX Z-code on the claim. Commercial payers often send genetic tests through lab benefit managers for prior authorization, and some tests are once-per-lifetime.
We code molecular tests to the most specific available code, attach Z-codes, manage prior authorization and handle the Medicare date-of-service rules for hospital patients.
Also see our medical coding, denial management, eligibility verification and revenue cycle management services.
CODING
Common molecular lab CPT & HCPCS codes we bill
Molecular codes include gene-specific codes, panels, PLA codes and unlisted codes.
| Code | Description | What we watch for |
|---|---|---|
| 81162 | BRCA1 and BRCA2 full sequence and duplication/deletion analysis | Coverage depends on personal and family history criteria. |
| 81220 | CFTR gene analysis, common variants | Often used for carrier screening. |
| 81225 | CYP2C19 gene analysis, common variants | Pharmacogenomic testing coverage is limited to specific drugs. |
| 81301 | Microsatellite instability analysis | Common in tumor testing. |
| 81445 | Targeted genomic sequence analysis panel, solid organ neoplasm, 5–50 genes | Billed once regardless of the number of genes in range. |
| 81455 | Targeted genomic sequence analysis panel, solid organ or hematolymphoid neoplasm, 51 or more genes | Payers often require prior authorization. |
| 0037U | Targeted genomic sequence analysis, solid organ neoplasm, 324 genes (PLA) | PLA codes identify a specific lab’s test. |
| 81528 | Oncology (colorectal) screening, multitarget stool DNA | Covered as a screening test at set intervals. |
| 87798 | Infectious agent detection by nucleic acid, not otherwise specified, amplified probe | Billed per organism; check payer limits for panels. |
| 81479 | Unlisted molecular pathology procedure | Requires documentation of the test and often a Z-code. |
Code descriptions are summarized. CPT® is a registered trademark of the American Medical Association. Coverage and payment rules vary by payer and change every year; we code to the current code set and your payers’ policies.
Modifiers that matter in molecular lab billing
90
Reference laboratoryWhen a test is sent to another lab for performance.
59 / XU
Distinct serviceFor separate tests NCCI pairs together.
GA
ABN on fileFor tests that may not be covered.
GZ
Expected denial, no ABNReports that denial is expected without an ABN.
DENIALS
Why molecular lab claims get denied
The denial reasons we see most often in molecular lab billing, with the claim adjustment reason code (CARC) payers usually attach, and what we do so they don't happen again.
Test not covered for the indication
Payers limit coverage to specific clinical criteria and history.
How we prevent it: We check criteria and document the indication before testing.
No prior authorization
Genetic testing is often managed by lab benefit managers.
How we prevent it: We submit authorization with clinical history and family history.
Once-per-lifetime limit
Germline tests may only be covered once.
How we prevent it: We check prior testing before billing.
Billed to the wrong entity
Tests for hospital patients may need to be billed to the hospital.
How we prevent it: We apply the lab date-of-service rules and exceptions.
HOW WE WORK
How we run your molecular lab revenue cycle
From the first eligibility check to the final patient payment, one dedicated team handles every step and reports back to you.
01
Eligibility and authorization
We verify coverage, benefits, copays and deductibles before the visit. For molecular labs, that includes prior authorization and coverage criteria for each test.
02
Charge capture and coding
Our coders review documentation and assign CPT, HCPCS and ICD-10-CM codes to the highest supported specificity. Tests are coded to the most specific CPT, PLA or Tier 2 code, with Z-codes added.
03
Claim scrubbing and submission
Every claim is checked against NCCI edits, payer policies and modifier rules before it goes out electronically, so it is paid on the first pass.
04
Payment posting and reconciliation
We post ERAs and EOBs, compare payments to your contracted rates and flag underpayments for appeal.
05
Denial management and A/R follow-up
Every denial is worked: corrected, appealed or escalated, with root causes fed back to the front end. Coverage and authorization denials are appealed with clinical history and test details.
06
Reporting and patient billing
You get clear monthly reports on collections, denials and A/R aging, and patients get easy-to-read statements and answers to billing questions.
COMPLIANCE
Molecular Lab payer rules we track for you
Rules that change how molecular lab claims must be coded, documented and submitted.
MolDX: many Medicare contractors require a technical assessment and DEX Z-code for molecular tests.
PLA codes: identify a specific lab’s test and should be used instead of general codes when they apply.
Date of service exception: certain molecular tests for hospital outpatients can be billed by the lab directly.
Germline versus somatic: coverage rules differ for inherited and tumor testing.
FAQ
Molecular Lab billing questions
Do you handle MolDX Z-codes?
Yes. We help register tests and attach Z-codes so Medicare claims are not rejected.
Can you manage genetic test prior authorizations?
Yes. We submit authorizations with clinical and family history and track decisions.
Do you bill patients for genetic tests?
Yes. We provide cost estimates, financial counseling and payment plans where appropriate.
How much do your molecular lab billing services cost?
We charge a percentage of what we actually collect for you, with no upfront or setup fees. Your rate depends on claim volume and the services you need, so we quote it after a free review of your current billing.
Do we have to change our EHR or practice management system?
No. We work inside the systems you already use, and your data stays yours. We set up secure access, learn your workflows and start working claims without disrupting your front desk.
Related specialties
FREE MOLECULAR LAB BILLING REVIEW
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