HCPCS code G0147 – Automated cervical or vaginal smear screening

Key takeaways

G0147 is the HCPCS Level II code a laboratory bills for screening a conventional cervical or vaginal smear by automated system under physician supervision.

The physician or practitioner who collects the smear bills Q0091, so G0147 never covers taking the sample.

Medicare covers a screening Pap test once every 24 months, or every 12 months for high-risk women and some women of childbearing age.

Common denials are frequency exceeded (CO-119), a diagnosis that doesn’t support the screen (CO-11), and a place of service mismatch (CO-5).

Medicare pays G0147 under the Clinical Laboratory Fee Schedule, so look up the rate in the current CLFS file.

HCPCS code G0147: Definition and key details

HCPCS code G0147 is the laboratory code for screening cytopathology smears, cervical or vaginal, performed by automated system under physician supervision. It describes how a conventional Pap smear slide is screened once it reaches the lab.

It does not describe taking the sample. The physician or practitioner who collects the smear reports that work with Q0091. Per the CMS HCPCS Level II code system, G-codes are assigned and maintained by CMS rather than the AMA. You can look up the neighboring G-codes in our full HCPCS code library.

What G0147 covers and what it does not

G0147 covers the laboratory screening of a conventional cervical or vaginal smear by an automated system, under physician supervision. The service starts once the slide arrives at the lab. Mixing up collection and screening is a frequent coding error with this code.

• Included: Automated screening of a conventional cervical or vaginal smear
• Included: Physician supervision of the automated screening process
• Excluded: Obtaining, preparing and sending the smear to the lab (report Q0091)
• Excluded: An automated screen that adds manual rescreening (report G0148, or G0141 when a physician interprets)
• Excluded: Thin-layer specimens collected in preservative fluid (report G0123 or G0124)
• Excluded: Diagnostic, non-screening cytopathology (use the CPT codes in the 88141–88175 range)
• Excluded: Colposcopy, biopsy or any other diagnostic or treatment procedure

A lab reports one screening code per smear, matched to how the slide was prepared and screened. G0147 is never added on top of another screening code for the same slide.

G0147 vs Q0091, G0123, G0124, G0141, and G0148: Choosing the right code

G0147 belongs to a family of Medicare codes that split the screening Pap test into collection and laboratory screening. The lab code depends on the preparation type and on whether rescreening or physician interpretation was added. The table below sets out each option.

The first decision is who performed the service. Q0091 is the collection code, billed by the practice that takes the sample. G0147 and the other screening codes belong to whoever screens or interprets the specimen.

Within the lab, preparation type decides the rest. G0123 is the thin-layer alternative to G0147, so a lab never bills the two for one specimen. G0124 covers thin-layer specimens that need physician interpretation, and it is never paired with G0147 either. The chart below maps both decisions to a single code.

Medicare coverage rules and G0147 frequency limitations

Medicare covers the screening Pap test under Part B’s preventive benefit, and its frequency limit applies to G0147 like every other code in the family. The deductible and coinsurance are waived on a correctly coded claim. Practices and labs both need the interval right to avoid CO-119 (frequency exceeded) denials.

Medicare counts the interval in full months. At least 11 months, or 23 months for the 24-month benefit, must pass after the month of the last covered screen. CMS lists these high-risk factors for cervical cancer:

• Early onset of sexual activity, under 16 years of age
• Multiple sexual partners, five or more in a lifetime
• A history of sexually transmitted disease, including HIV infection
• Fewer than three negative Pap tests, or none, in the previous seven years

For vaginal cancer, the high-risk factor is DES (diethylstilbestrol) exposure before birth. Women of childbearing age also qualify for annual screening after an abnormal result. That applies when an exam in any of the preceding three years showed cancer or another abnormality.

The chart must record the specific factor that justifies annual billing. Running insurance eligibility verification at scheduling catches most frequency problems before the smear is even taken.

Required ICD-10 diagnosis codes when billing HCPCS code G0147

Every G0147 claim needs an ICD-10-CM diagnosis code that supports screening. The lab usually takes it from the requisition, so the code chosen at collection carries through to the lab claim. A missing or unsupported code is the most consistent technical denial after frequency.

Always verify accepted diagnosis codes against the current coverage policy for cervical cytology in your MAC jurisdiction. Policies vary by region and change independently of the national code set. An annual screen billed with only Z12.4 risks a frequency denial, because the claim shows no high-risk reason.

Documentation requirements for a G0147 claim

Medicare auditors reviewing HCPCS code G0147 claims look for proof of screening intent, the right interval and a properly handled specimen. Missing any of these can lead to a recoupment request in post-payment review. Practices with solid medical billing compliance protocols spot these problems before the claim goes out.

• Indication for screening: A note or requisition confirming a preventive screen, not a diagnostic test
• Risk classification: Average-risk or high-risk status, with the specific high-risk factor recorded when annual screening is billed
• Date of last screening: The date of the prior Pap test, confirming the 12-month or 24-month interval has been met
• Lab requisition: A completed requisition matching the collection date, specimen type, diagnosis code and ordering provider
• Screening method: Lab records showing a conventional slide screened by automated system under physician supervision
• Patient eligibility: Confirmation that the patient is a Medicare Part B beneficiary

The two halves of this record live in different places. The collecting practice owns the risk factor and the last-screening date, while the lab owns the screening method. The requisition is where the two have to agree.

Who can bill G0147? Eligible providers and supervision requirements

HCPCS code G0147 is billed by the laboratory that performs the automated screen, not by the practice that collects the smear. That split matters in OB-GYN and women’s health settings, where the collecting clinician, the ordering provider and the lab are often different.

• Independent laboratory: Bills G0147 when it screens the smear, usually with POS 81
• Hospital laboratory: Bills G0147 under the hospital’s own claim rules when its lab performs the screen
• Physician office laboratory: May bill G0147 only when it runs the automated screen itself and holds a CLIA certificate that covers cytology
• Collecting physician or practitioner (MD, DO, NP, PA, CNM): Bills Q0091 for obtaining, preparing and sending the smear, never G0147

The supervising physician named in the descriptor oversees the lab’s automated screening, not the collection visit. Check your MAC’s laboratory billing guidance before an office lab reports G0147. On the practice side, accurate superbill documentation should capture Q0091, the screening diagnosis and the ordering provider.

Modifiers and place of service for G0147

G0147 does not routinely require a modifier on a standard Medicare fee-for-service claim. Two situations can call for one.

For place of service, POS 81 (independent laboratory) is the most common setting for G0147. A hospital lab follows the hospital’s own claim rules. A place of service that conflicts with the billing provider can return a CO-5 denial, which a corrected claim usually fixes.

Bundling rules and NCCI edits for HCPCS code G0147

The National Correct Coding Initiative (NCCI) publishes edit pairs that restrict which codes one provider can bill together on the same date. For G0147, the main rule is simpler. Report one screening code per smear. Knowing how to submit a clean claim avoids most cytopathology billing errors.

• G0147 + G0148 (same smear): Not appropriate. Both report screening of the same smear, so billing both is duplicative.
• G0147 + G0123 or G0124 (same specimen): Not appropriate. G0123 and G0124 cover thin-layer preparations, so the preparation type decides which code applies.
• G0147 + G0141 (same smear): Choose one. G0141 applies when the automated screen adds manual rescreening and physician interpretation.
• Q0091 + G0147: Expected for one screening Pap test. Q0091 is the collection and G0147 is the lab screen, normally billed by different providers.
• Q0091 + E/M visit (same day): Allowed when a separately identifiable problem-oriented visit is documented, with modifier 25 on the E/M code.

NCCI edits are updated quarterly. Check the current edit files on the CMS NCCI page before relying on any edit pair, including those listed here.

Medicare reimbursement for G0147 under the Clinical Laboratory Fee Schedule

Medicare pays G0147 under the Clinical Laboratory Fee Schedule (CLFS), not the Physician Fee Schedule. The CLFS sets one national payment amount per code, with no geographic adjustment. Download the rate for the quarter you are billing from the CMS CLFS files page, since amounts can change each quarter.

Because the screening Pap test is a preventive service, the patient pays no deductible or coinsurance. The collection is paid separately, with Q0091 falling under the Physician Fee Schedule. Medicare Advantage plans set their own rates, so check the plan contract before quoting a figure.

Top reasons G0147 claims are denied and how to fix them

HCPCS code G0147 has a predictable denial pattern. Most rejections trace back to five causes, each with a claim adjustment reason code and a clear fix. Effective denial management for cytopathology catches these before submission rather than on appeal.

Frequency denials are the hardest to reverse. Medicare holds the patient liable only when a valid ABN was signed before the service. When the interval hasn’t passed, the collecting practice should tell the patient and record their choice before taking the smear.

Billing G0147 for high-risk vs average-risk patients

Risk status changes the frequency, the diagnosis code and the documentation on a G0147 claim. The lab bills from the requisition, so a risk factor that never reaches it can’t support an annual claim. The table below lays out each path.

A lab that bills G0147 annually for an average-risk patient will get a CO-119 denial, and no modifier fixes that. The fix is documenting the CMS-defined high-risk factor in the chart and on the requisition before the first annual screen. A general note that says “high-risk patient” is not enough.

How Pabau keeps Pap screening records and claims in step

Many women’s health practices still track Pap screening on paper requisitions and spreadsheets. Staff retype the risk factor and the last-screening date from the visit note. Every retyped field is a chance for the lab claim to fail.

Pabau, the all-in-one practice management system we build, keeps the appointment, the treatment note, the forms and the invoice on one patient record. Digital intake forms can ask for the last Pap date and any high-risk factor before the visit. The clinician then has both in front of them when collecting the smear.

For OB-GYN teams, Pabau keeps Q0091, the screening diagnosis and the ordering provider next to the note. Its claims tools then build cleaner insurance claims from that same record, so details aren’t copied between systems.

The result is fewer retyped fields between the exam room and the claim. Requisitions reach the lab complete, and fewer frequency denials come back.

Keep Pap screening claims tied to the record

Pabau keeps the visit note, screening history, forms and invoice on one patient record. Your team bills Q0091 and sends complete requisitions without retyping details.

Book a demo

Conclusion

G0147 is a lab code, and most of its billing problems start when it is treated as a collection code. Get that split right first. The practice bills Q0091 for the smear, and the lab bills G0147 for the automated screen.

After that, the claim depends on two facts the collecting practice controls: the date of the last screen and the documented risk factor. Put both on the requisition, and the lab can bill the right interval without a CO-119 coming back.

Billing teams that keep the visit note and the requisition in one place spend less time correcting claims. Book a demo to see how Pabau keeps Pap screening records and claims in step for women’s health practices.

Continue your research

Need to understand denial codes by remark number? Denial codes in medical billing explains the most common CMS adjustment reason codes and how to respond to each one.

Want a framework for submitting claims without errors? Clean claim best practices walks through the pre-submission checklist that reduces first-pass denial rates.

Handling insurance eligibility before the appointment? Insurance eligibility verification covers real-time eligibility checks and how to integrate them into scheduling workflows.

Billing an automated screen that added a physician review? HCPCS code G0141 covers the rescreening and interpretation version of this service.

Working with thin-layer specimens instead? HCPCS code G0123 explains the liquid-based alternative to G0147 and how labs bill it.

Frequently asked questions