ICD-10 code Z31.0: Encounter for reversal of previous sterilization

Key takeaways

ICD-10 code Z31.0 describes an encounter for reversal of previous sterilization, covering both tubal ligation reversal (tuboplasty) and vasectomy reversal (vasoplasty) under one billable code.

Z31.0 became effective October 1, 2025 as part of the 2026 ICD-10-CM edition. It is billable and valid for reimbursement in inpatient and outpatient settings.

Substituting infertility codes such as N97.x or N46.x is the most common mistake. Z31.0 leads whenever the documented reason for the encounter is the reversal itself.

Practice management software like Pabau helps reproductive health practices document Z31.0 encounters accurately and route clean claims through the Claim.MD clearinghouse.

ICD-10 code Z31.0 is a billable diagnosis code for an encounter for reversal of previous sterilization. It covers tubal ligation reversal (tuboplasty) and vasectomy reversal (vasoplasty) under one code, whatever the patient’s sex.

The code took effect on October 1, 2025 in the 2026 ICD-10-CM edition. It is valid for reimbursement in inpatient and outpatient settings, as confirmed by the CDC/NCHS ICD-10-CM web tool. Denials on these encounters rarely come from the code choice. They come from what the record does or does not say.

Applicable to: Tuboplasty and vasoplasty

The official ICD-10-CM Applicable To notes under Z31.0 cover two distinct clinical scenarios. Both fall under the same code regardless of the patient’s sex.

• Encounter for tuboplasty for reversal of previous sterilization. This is tubal ligation reversal in female patients. The fallopian tubes are surgically reconnected after a prior ligation, occlusion, or removal of a segment.
• Encounter for vasoplasty for reversal of previous sterilization. This is vasectomy reversal in male patients. The vas deferens is surgically reconnected after a prior vasectomy.

Neither the patient’s sex nor the surgical technique changes the diagnosis code. Z31.0 applies whenever the documented reason for the encounter is reversal of a previous sterilization. A patient may also carry a concurrent infertility diagnosis that needs separate management. Code that diagnosis as secondary and keep Z31.0 as the principal diagnosis.

Z31 category: Encounter for procreative management

Z31.0 is a child code of the Z31 parent category, which covers all encounters for procreative management. Knowing the sibling codes helps when the clinical picture is more complex than a straightforward reversal encounter.

The CMS ICD-10 codes page carries the full Z31 tabular list and the annual updates. Bookmark it, because the Z31 subcategory structure is revised each October.

CPT codes commonly used with Z31.0

ICD-10 code Z31.0 is the diagnosis code. The procedure performed is captured separately using CPT codes, as confirmed by the AAPC ICD-10-CM code lookup. The codes below are the ones commonly paired with Z31.0 in practice, not guaranteed payer-accepted combinations. Verify current CPT codes with the AMA and confirm coverage policies before you submit.

CPT 55400 is a single code for vasovasostomy, and it covers the repair whether it is unilateral or bilateral. Report a bilateral repair with modifier 50 or with two units, following the payer’s own instructions. There is no separate bilateral vasovasostomy code to reach for.

Coverage for sterilization reversal varies significantly by payer. Medicare generally does not cover these procedures, and private insurer policies differ by plan and by state. Running insurance eligibility verification before the consultation tells you which of those applies to this patient.

Documentation requirements for Z31.0

A correctly assigned Z31.0 still fails a payer audit if the medical record does not support it. Three elements have to appear in the chart.

1. Reason for the encounter stated explicitly. The note must document that the patient presents for reversal of a previous sterilization. “Desires pregnancy” alone is insufficient. The record must name the reversal procedure sought.
2. Prior sterilization history confirmed. The chart should reference the original sterilization procedure, including type, approximate date if known, and any operative records available. Coders cannot assume a sterilization history from the procedure request alone.
3. Procedure type identified. Tuboplasty or vasoplasty must be specified to support the Applicable To inclusions. A record that says only “sterilization reversal” may come back for clarification.

Digital intake forms that prompt for prior sterilization history at registration capture that detail before the clinician opens the chart. Structured fields are also faster to audit than free-text notes when a payer asks for support.

Common coding errors to avoid

Claim denials on sterilization reversal encounters follow predictable patterns. Most trace back to one of four mistakes, and the first is a decision about which diagnosis leads the claim.

• Using infertility codes instead of Z31.0. Where the reason for the encounter is the reversal procedure, Z31.0 is the correct principal diagnosis rather than N97.x (female infertility) or N46.x (male infertility). Reserve the infertility codes for encounters where a workup or management of infertility is the primary clinical reason.
• Omitting prior sterilization documentation. Z31.0 is an encounter code, not a condition code. It requires a documented history of prior sterilization in the record. A claim submitted without that history is likely to be returned.
• Assigning Z31.0 to a fertility workup visit. If the patient attends for investigation only, with no reversal planned or discussed, Z31.4x is the appropriate code. Z31.0 is reserved for encounters aimed at the reversal procedure.
• Coding the reversal as the secondary diagnosis. When the clinical reason for the visit is the sterilization reversal encounter, Z31.0 is the principal diagnosis. A concurrent infertility diagnosis becomes secondary, never the reverse.

A denial that does slip through arrives with a reason code naming the problem. Our guide to medical billing denial codes explains what the common ones ask a coder to fix before resubmission.

Related ICD-10 codes for fertility and reproductive management

These codes appear most often in the same clinical contexts as Z31.0. Several of them are secondary codes, so read the relationship column before you attach one to a reversal claim.

How Pabau supports accurate coding for procreative encounters

Reproductive health practices running high volumes of procreative management encounters need a documentation workflow that keeps Z31.0 claims clean from intake through submission. Today that usually means a coder emailing a clinician for a chart amendment days after the visit.

Practice management software like Pabau gives billing teams claims software for practices that connects to Claim.MD, our US clearinghouse partner. Claim.MD routes completed claims to thousands of US payers.

The integration supports real-time eligibility verification, CMS-1500 and 837P electronic claim submission, and ERA/835 remittance processing. Your billing team knows whether the payer has the patient on record as eligible before a claim leaves your system.

Structured intake captures prior sterilization history at registration rather than as an afterthought. That data flows into the clinical record, giving coders the documentation Z31.0 needs without chasing clinicians for amendments.

Denied claims come back through the same connection with structured denial reason codes. Your team can correct and resubmit instead of decoding rejection letters by hand.

Keep Z31.0 claims clean from intake to payment

Pabau connects reproductive health practices to the Claim.MD clearinghouse for real-time eligibility checks, clean claim submission, and ERA remittance processing. See how structured documentation reduces denials on procreative management encounters.

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Conclusion

Z31.0 is a single billable code covering both tubal ligation reversal and vasectomy reversal encounters. Picking it is the easy part. Practices lose clean claims on the documentation behind it: the prior sterilization, the reason for the visit, and the procedure type.

So build the prior sterilization question into your intake forms rather than leaving it to the consult note. That single change puts the supporting history in the chart before a coder goes looking for it. It also costs less than appealing the denial it prevents. Book a demo to see how Pabau keeps procreative management encounters documented and submitted in one workflow.

Continue your research

Submitting IVF procedure codes alongside Z31.0? IVF CPT codes covers the procedure billing side of assisted reproductive technology encounters, including common crosswalk considerations.

Need a clearinghouse that handles reproductive health claims? Claim.MD vs Office Ally compares the two US clearinghouses most commonly used by specialty practices on volume reproductive health billing.

Coding a contraception encounter next? ICD-10 code Z30.46 walks through the surveillance code for implantable contraceptives and the documentation payers expect with it.

Frequently asked questions