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Last Updated: July 30, 2026
Key takeaways
ICD-10 code O62.0 is a billable ICD-10-CM diagnosis code for primary inadequate contractions, valid for fiscal year 2026 (effective October 1, 2025).
Applicable to female patients only. The official inclusion terms are failure of cervical dilatation, primary hypotonic uterine dysfunction, and uterine inertia during the latent phase of labor.
Distinguish carefully from O62.1, secondary uterine inertia. The primary versus secondary distinction affects medical necessity documentation and reimbursement.
Pabau’s claims management software supports HIPAA-covered obstetric billing workflows, helping labor and delivery teams document and submit O62.0 accurately.
ICD-10 code O62.0 is a billable, specific diagnosis code for primary inadequate contractions during labor. Coders assign it when uterine activity fails to establish an effective pattern in early labor. That includes cervical dilatation that stalls, contractions that never settle into a regular rhythm, or a latent phase that stretches beyond normal limits.
Getting the code right matters because downstream decisions, from oxytocin augmentation to cesarean delivery, rely on a well-documented diagnosis. This reference covers the code definition, billable status, included conditions, and excludes notes. It also covers the ICD-10-CM classification hierarchy, related sibling codes, documentation practices, and billing implications for obstetric teams.
ICD-10 code O62.0: Definition, billable status, and 2026 validity
ICD-10 code O62.0 is a billable, specific ICD-10-CM diagnosis code representing primary inadequate contractions. It is valid for fiscal year 2026, with an effective date of October 1, 2025, and is accepted for submission in HIPAA-covered healthcare transactions. The code applies to female patients only.
No additional character is required to make the code more specific. O62.0 is already the most granular assignment within its category for this condition.
The official short description is “Primary inadequate contractions.” The Centers for Medicare and Medicaid Services (CMS) ICD-10-CM tabular list places this code in Chapter 15, Pregnancy, childbirth and the puerperium (O00-O9A). Within that chapter, it falls under the O60-O77 block for complications of labor and delivery, in the O62 category for abnormalities of forces of labor.
O62.0 code details at a glance
The table below summarizes the key administrative and billing attributes for this diagnosis code. Coders can use it as a quick-reference checkpoint before submitting obstetric claims.
Conditions included under O62.0
The ICD-10-CM official tabular list includes three distinct clinical presentations under O62.0. Coders should assign this code whenever the documented diagnosis corresponds to any of the following conditions. Each represents a failure of uterine contractile activity to achieve adequate cervical progress in the first stage of labor.
Failure of cervical dilatation
Failure of cervical dilatation describes a clinical scenario in which the cervix does not open at the expected rate. This can occur during the active or latent phase of labor. In obstetric practice, progress is typically measured in centimeters per hour, and a stalled examination finding over a defined period triggers this diagnosis.
Some providers document this as arrest of dilation, which maps to O62.0 only when inadequate contractions, not obstruction, caused the stall. It is coded under O62.0 when uterine contractions are present but inadequate in frequency, duration, or intensity to drive dilatation forward.
This condition is one of the most common reasons a labor team activates augmentation protocols. Accurate documentation of the dilatation curve in the patient’s clinical record is essential before the code can be assigned with confidence.
Primary hypotonic uterine dysfunction
Primary hypotonic uterine dysfunction refers to an absence or weakness of uterine contractions from the outset of labor. No period of normal contractile activity precedes it. This is the official ICD-10-CM inclusion term for the parent diagnosis, though many obstetric providers still document it as primary uterine inertia.
When a provider writes “primary uterine inertia” in the delivery record, that maps to O62.0. This synonymous terminology is common, so coders should verify the mapping before assigning the code. Check it against the AAPC’s ICD-10-CM code lookup or the official alphabetic index.
Uterine inertia during latent phase of labor
Uterine inertia during the latent phase describes contractions that stay weak or infrequent through the first stage, before active labor begins. This inadequate contractile activity often extends the latent phase well past the expected timeframe. That means more than 20 hours in nulliparous patients, or more than 14 hours in multiparous patients. Clinical thresholds still vary by institution and provider.
O62.0 is the appropriate code when contractions are inadequate throughout the latent phase. It is not appropriate when a fetal or maternal mechanical obstruction causes the delay. Coders should review the clinical notes carefully to distinguish this from obstructed labor, which carries a different code assignment entirely.
Excludes notes for O62.0
Understanding the excludes notes attached to the O62 category prevents incorrect dual-coding. The following conditions must not be coded together with O62.0 as the same presentation, or are excluded entirely from this code range.
- Excludes2 (O62 category): Conditions in O62 may coexist with other complications of labor and delivery. Review the excludes2 notes for adjacent codes in Chapter 15 when assigning multiple diagnosis codes to the same encounter. The excludes2 designation means the excluded condition is not part of the O62 condition but may be present simultaneously.
- Gender restriction: O62.0 is applicable to female patients only. Claims submitted with a male patient will be rejected. This constraint is embedded at the code level, so automated claim-scrubbing tools should catch it, but coders should verify demographic data matches before submission.
- Contractions in pregnancy without true labor: Contractions in pregnancy that do not represent true labor, such as Braxton Hicks contractions, are not coded to O62.0. These are typically left uncoded, or fall under a false labor code (O47), depending on documentation.
For the authoritative, always-current list of excludes notes, cross-reference the CDC/NCHS ICD-10-CM web tool, which mirrors the official tabular list published by CMS and NCHS.
ICD-10-CM hierarchy: Where O62.0 fits within abnormalities of forces of labor
Knowing where a code sits in the ICD-10-CM tree helps coders navigate parent categories and understand the scope of related codes. It also helps them explain the classification to clinical documentation improvement (CDI) specialists. The table below maps the full hierarchy for O62.0.
The WHO ICD-10 browser provides the international classification context for Chapter 15. In the US, the clinical modification (ICD-10-CM) is administered jointly by CMS and the National Center for Health Statistics (NCHS). The WHO base classification already lists O62.0 with the same inclusion terms. The fourth-character subdivision is inherited from WHO, not a US-only addition.
Related ICD-10 codes in the O62 category
Accurate differential coding within the O62 category requires familiarity with all sibling codes. The distinction between O62.0 and O62.1, in particular, is a frequent source of coding errors with direct reimbursement consequences. The table below covers the full O62 category for quick reference.
Practices managing OB/GYN billing workflows should embed these distinctions in coder training. That includes teams running pelvic health software for postpartum follow-up.
The O62.0 versus O62.1 distinction is clinically significant. Primary hypotonic uterine dysfunction (O62.0) begins at the onset of labor. Secondary uterine inertia (O62.1) follows an initial period of adequate contractions that then fail. Payers and CDI programs flag these separately.
Coders reviewing records should confirm from the labor progress notes whether contractions were ever adequate before they weakened or stopped. When that information is not documented, a query to the provider is appropriate before assigning O62.0.
Documentation that only states “inadequate contractions” without specifying timing can point coders toward contractions unspecified. In the ICD-10-CM index, that ambiguous presentation maps to O62.9, not O62.0.
Pro Tip
Document the specific phase of labor (latent vs. active) and the time elapsed since onset in the delivery record. This supports both the O62.0 vs. O62.1 distinction and the medical necessity determination for oxytocin augmentation or cesarean delivery. A note that reads only ‘poor contractions’ is not sufficient for confident O62.0 assignment.
Clinical documentation tips for O62.0
Coding accuracy for obstetric labor complications depends almost entirely on what the provider documents. For ICD-10 code O62.0 specifically, the following elements must appear in the clinical record to support the assignment.
- Phase of labor at onset of abnormality: Note whether the inadequate contractile activity was present from the beginning, in the latent phase. Or note whether it developed after a period of apparent progress. This is the primary differentiator between O62.0 and O62.1.
- Contraction frequency, duration, and intensity: Quantify using intrauterine pressure catheter readings or tocodynamometry data where available. “Contractions every 8-10 minutes, 30 seconds duration” is more defensible than “irregular contractions.”
- Cervical examination findings over time: At least two timed cervical checks should show the dilatation curve. That evidence supports failure of cervical dilatation as an includes condition under O62.0.
- Response to intervention: If oxytocin augmentation or amniotomy was performed, document the indication. Practice management software like Pabau, via its prescription management software, should reflect that diagnosis code.
- Exclusion of mechanical obstruction: If cephalopelvic disproportion or malpresentation was ruled out, document that finding. It distinguishes inadequate contractions from obstructed labor (O65-O66), which carries different coding implications.
Practices using structured digital forms for labor assessment can build these documentation prompts directly into the encounter workflow. This reduces the likelihood of incomplete records at coding time. A provider’s note is sometimes ambiguous about whether inertia was primary or secondary. A structured clinical documentation tool can help capture that detail at the point of care rather than retrospectively.
How O62.0 affects labor management and billing
ICD-10 code O62.0 as a primary diagnosis on the delivery claim communicates to payers that medical necessity existed for labor interventions beyond routine monitoring. This has direct billing implications for three common scenarios.
Obstetric teams relying on integrated claims management workflows can reduce denial rates on these encounters. Pairing the O62.0 assignment with complete procedure coding and supporting documentation in the clinical record helps that effort.
Oxytocin augmentation of labor
When a provider administers oxytocin to strengthen inadequate contractions, the O62.0 diagnosis supports medical necessity for the augmentation. The procedure code for oxytocin infusion is typically a CPT or HCPCS J-code for the drug, plus an administration code.
Report it alongside O62.0 as the primary diagnosis code. Without a documented diagnosis such as primary inadequate contractions, the augmentation may be queried by payers as elective rather than medically indicated.
Cesarean delivery
If primary inadequate contractions progress to a situation requiring cesarean delivery, O62.0 is typically reported as a complicating condition on the delivery claim.
The cesarean delivery procedure codes (CPT 59514, 59515, or their ICD-10-PCS equivalents in inpatient settings) require a supporting diagnosis that explains the clinical rationale. O62.0 fulfills that role when the indication is failure to progress attributable to inadequate contractions.
Extended monitoring and admission
A prolonged latent phase may trigger observation admission or inpatient admission for monitoring and management. O62.0 as a diagnosis code on the observation or inpatient record supports the clinical decision to admit rather than discharge.
Coders should confirm from the record that the extended stay was driven by the inadequate contractile activity rather than another complication. Accurate obstetric compliance documentation at the inpatient level protects against audit risk when O62.0 is the primary driver of the admission.
How Pabau supports accurate O62.0 documentation and claims?
Many labor and delivery teams still document contraction patterns on a paper flow sheet during delivery. The coder then has to interpret the notes after the fact. Do they say “poor contractions,” or something specific enough to support O62.0 over O62.1 or O62.9?
Pabau keeps the labor timeline, cervical exam findings, and intervention notes in one patient record. The code the coder assigns then matches what the clinical team documented at the bedside.
That consistency reduces post-submission payer queries and speeds up reimbursement for labor complications. It also lowers audit risk when O62.0 drives medically necessary interventions like oxytocin augmentation or cesarean delivery.
Streamline obstetric documentation and claims
Pabau helps labor and delivery teams capture structured clinical notes and manage HIPAA-compliant records. Teams submit accurate diagnosis codes like ICD-10 code O62.0 with fewer errors and faster reimbursement.
Pro Tip
Review the labor flow sheet against the coded diagnosis before claim submission. If O62.0 is assigned but the labor notes show contractions were normal for the first four hours, the correct code is O62.1, not O62.0. This type of error is a common trigger for payer audits on obstetric claims.
Conclusion
Primary inadequate contractions represent one of the most consequential labor complications for downstream clinical and billing decisions. Getting ICD-10 code O62.0 right means distinguishing it from secondary uterine inertia (O62.1) and documenting the phase of labor and contractile activity with specificity. It also means pairing the diagnosis with appropriate procedure coding for augmentation or delivery interventions.
Pabau’s claims management software and structured documentation tools help obstetric practices capture the clinical detail that supports accurate O62.0 assignment and cleaner claim submissions. To see how Pabau supports OB/GYN and labor and delivery workflows, book a demo.
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Frequently asked questions
What is ICD-10 code O62.0?
ICD-10 code O62.0 is a billable ICD-10-CM diagnosis code for primary inadequate contractions. It covers failure of cervical dilatation, primary hypotonic uterine dysfunction, and uterine inertia during the latent phase of labor. The code is valid for fiscal year 2026 (effective October 1, 2025) and applies to female patients only.
Is O62.0 a billable ICD-10-CM code?
Yes. O62.0 is a billable, specific ICD-10-CM code valid for submission in HIPAA-covered transactions for fiscal year 2026. No additional character is required to achieve specificity; O62.0 is already the most granular code assignment for this condition within the O62 category.
What is the difference between O62.0 and O62.1?
O62.0 (primary inadequate contractions) describes abnormal or absent uterine contractile activity from the onset of labor, with no prior period of normal contractions. O62.1 (secondary uterine inertia) applies when contractions were initially adequate but then ceased or weakened, representing an arrest of the active phase. Assigning the wrong code affects medical necessity documentation and reimbursement.
What conditions are included under O62.0?
The official ICD-10-CM includes notes list three conditions under O62.0. These are failure of cervical dilatation, primary hypotonic uterine dysfunction, and uterine inertia during the latent phase of labor. All three represent forms of inadequate uterine contractile activity occurring before or during the early first stage of labor.
When did ICD-10-CM code O62.0 become effective for 2026?
ICD-10-CM code O62.0 became effective on October 1, 2025, for fiscal year 2026. This follows the standard annual CMS update cycle. The code was also valid in prior fiscal years; the 2026 designation confirms continued validity for claims submitted on or after October 1, 2025.
How does O62.0 support medical necessity for cesarean delivery?
O62.0 documents that primary inadequate contractions were present and that labor failed to progress due to insufficient contractile activity. This diagnosis, combined with documented evidence of failure to progress and exclusion of mechanical obstruction, supports medical necessity for cesarean delivery. Submit it alongside appropriate procedure codes.
Is failure to progress the same as ICD-10 code O62.0?
No. Failure to progress describes a general labor arrest and can stem from inadequate contractions or from mechanical obstruction. Coders need documentation that specifies the cause before assigning O62.0 or a different code.
Is failure to descend in labor the same as O62.0?
No. Failure to descend describes the fetal head not moving down the birth canal in the second stage of labor. That is a different problem from the inadequate uterine contractions O62.0 describes. It often points to a mechanical or positional cause rather than a contraction disorder.
