What Is CPT 59025 and How Is a Fetal Non-Stress Test Billed

What does CPT code 59025 represent

CPT 59025 is the code for a fetal non-stress test (NST). An NST checks the baby's heart rate and how it responds to movement during pregnancy. It may be suggested when fetal movement decreases or the pregnancy needs closer monitoring.

NSTs are commonly performed during the third trimester. They may be recommended earlier in some high-risk pregnancies when the results could help guide medical care.

The 59025 CPT code covers the non-stress test service, including its technical and professional components when both are provided by the billing entity.

Is CPT 59025 Included in Global Maternity Billing

Routine prenatal visits and NSTs are not always billed the same way. Under the traditional 2026 global maternity package, routine prenatal care may be included, while a medically necessary NST may be reported separately when payer and coding requirements are met.

For example, if a patient reports decreased fetal movement during a prenatal visit and the provider performs an NST, the visit may fall under the maternity package while the NST is separately reportable.

2027 update: Global maternity coding changes January 1, 2027. Check the applicable 2027 CPT codes and payer requirements before billing.

How to Bill CPT 59025 for a Fetal Non-Stress Test 

Before billing CPT 59025, make sure the medical record supports why the fetal non-stress test (NST) was performed.

Start with the indication. The chart should document the reason for testing, such as decreased fetal movement or a pregnancy complication that requires fetal monitoring. The NST findings and provider's interpretation should also be recorded.

Next, check where the NST was performed and whether the professional and technical components are being billed separately. The correct billing approach can vary by setting and payer.

Finally, review the claim for other fetal monitoring services performed during the same encounter. Check payer rules and NCCI guidance before reporting CPT 59025 with another procedure to avoid duplicate or incorrect billing.

A supported diagnosis, complete NST documentation, and the correct billing components can help prevent CPT 59025 denials.

Can CPT 59025 Be Billed With Other Fetal Monitoring Codes

An ultrasound procedure and an NST may be reported on the same date when both are medically necessary and separately reportable.

The important detail is whether the ultrasound code already includes non-stress testing.

CPT Code	Description	NST included?
59025	Fetal non-stress test	This is the NST
76818	Fetal biophysical profile with NST	Yes
76819	Fetal biophysical profile without NST	No
76815	Limited obstetric ultrasound	No

For example, if a patient receives a complete biophysical profile with NST, CPT 76818 describes that combined service. Reporting 59025 separately for the same NST would generally be incorrect.

A modified biophysical profile may involve an NST and an ultrasound assessment of amniotic fluid. When properly performed and documented, CPT 59025 and 76815 may be reported according to applicable coding and payer rules.

For related ultrasound coding information, see our article on how to bill CPT code 76805.

Documentation Requirements For Fetal Non-Stress Test

Proper CPT 59025 documentation should explain why the fetal non-stress test (NST) was performed, what the monitoring showed, and the provider's interpretation. The medical record should include:

• Gestational age at the time of testing.

• Start and end time of fetal monitoring.

• Fetal heart rate baseline, variability, accelerations, and decelerations.

• NST interpretation: reactive, nonreactive, or inconclusive.

• Name and authentication of the interpreting provider.

• Follow-up recommendations or additional testing, if needed.

• Diagnosis code that matches the documented reason for testing. For more information about maternity package billing, read our global OB billing CPT codes guide

How 3 Axis RCM Helps OB/GYN Practices With NST Billing 

NST billing is one part of an OB/GYN practice's revenue cycle. It connects with maternity packages, ultrasound coding, diagnosis selection, and payer-specific claim requirements.

At 3 Axis RCM, our OB/GYN medical billing services help practices review coding accuracy, verify claim details, manage denials, and follow up on unpaid balances.

We work with OB/GYN practices to identify billing issues before claims are submitted and resolve payment problems when they occur.

If your practice regularly handles fetal monitoring, ultrasound, and high-risk pregnancy claims, having these services reviewed as part of the same billing process can help prevent avoidable errors.

FAQ

What is the CPT code for fetal monitoring during pregnancy?

CPT 59025 is used for a fetal non-stress test (NST), which monitors fetal heart rate and response to movement during pregnancy when additional fetal surveillance is medically necessary. 

Does CPT 59025 require a modifier?

CPT 59025 does not automatically require a modifier. The correct modifier depends on how and where the NST was performed and whether professional or technical components are billed separately.

How many ultrasounds will insurance cover during pregnancy? 

Insurance coverage for pregnancy ultrasounds varies by plan and medical necessity. There is no single number that applies to every patient, so verify the payer's coverage requirements before billing. 

Do you bill 59025 twice for twins? 

CPT 59025 is reported based on the NST service, not the number of fetuses. For twins, follow the payer's billing instructions and documentation requirements. 

Can you bill 76816 and 59025 together?

CPT 76816 and 59025 may be reported together when both services are medically necessary and separately performed. Check NCCI edits, documentation, and payer rules before submitting both codes.