OHIP Billing Guide🩺 ServicePublished 2026
A661

A661 OHIP Billing Code: Efficient Management of Complex Pediatric Cases

A661 is billed for complex medical re-assessments of pediatric patients with chronic multi-system conditions, managed by a pediatrician.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference86.35 CAD~3 min read

1What Is the A661 OHIP Code?

Definition

A661 is an OHIP billing code used for complex medical specific re-assessments of pediatric patients. This occurs when a pediatrician reassesses a child with complex or multi-system conditions.

Clinical Context

Typically, these re-assessments involve children with chronic neurologic, metabolic, or genetic conditions where multiple active problems need to be reconciled in each visit. By systematically reviewing these complexities, healthcare providers ensure comprehensive and continual care.

Why Commonly Missed

This code might be overlooked when documentation doesn't sufficiently capture the complexity or fails to clearly delineate this from standard re-assessments, leading to missed billing opportunities.

2Related Codes

CodeNameFrequencyDescription
A263Medical specific assessment in the Paediatrics (26) listingsBased on the General Preamble rulesInitial assessment specific to pediatric cases, especially useful in chronic cases.
C263Medical specific assessment in the Paediatrics (26) listingsGoverns hospital in-patient assessmentsEquivalent in-patient assessments for hospitalized children.
A264Medical specific re-assessment in the Paediatrics (26) listingsGoverned by the General PreambleA simpler re-assessment alternative in outpatient settings.
C264Medical specific re-assessment in the Paediatrics (26) listingsIn-patient equivalent of A264Re-assessments for hospitalized pediatric patients.

3Eligibility Requirements

Eligibility Requirements

  • A661 can be rendered and billed under specific conditions as described in the Paediatrics listing and the General Preamble GP21.
  • This code is applicable for complex medical specific re-assessments performed by a pediatrician revisiting a child with multi-system health issues.
  • To be billed for a hospital in-patient equivalent, use code C661.
  • Virtual Care: A661 may also be delivered virtually and billed as A661A, whether via video or telephone consultations.

4What Your Clinical Note Must Show

1Document Requirements for A661 Billing

Comprehensive charting is crucial for billing A661, ensuring all elements are documented:

  • Details of the complex or multi-system condition.
  • Evidence of reevaluating multiple active issues.
  • Description of the management plan for ongoing conditions.
  • Inclusion of developmental surveillance approaches, if applicable.

5Weak vs. Strong Note Examples

The strong note succeeds because it captures the complexity and active management of multi-system issues, providing robust justification for A661 billing. The weak note fails as it lacks sufficient detail on the complexity handled.

Weak Note

Patient seen for follow-up. No changes made to the management plan. Reviewed lab results.

Strong Note

Patient presents with ongoing challenges in managing multiple conditions including metabolic and genetic disorders.

  • Thorough reconciliation of all active issues, including neurological assessments.
  • Adjusted management plan in consultation with interdisciplinary teams.
  • Documented developmental indicators and adjustments made to current therapies.

6Common Reasons This Code Is Missed

1
Insufficient Documentation of Complexity
Failure to clearly document the complexity of the condition might lead to underutilization of this code.
2
Misidentifying Re-assessment Needs
Clinicians may mistakenly use standard re-assessment codes instead of A661 for complex cases.
3
Lack of Awareness of Code Specificity
Healthcare providers might not be fully aware of A661's distinct eligibility and documentation requirements.
Document A661 correctly — every time
Empathia's templates automatically structure your notes to capture every required element for audit-proof billing.

8Frequently Asked Questions

What is the fee for A661 under OHIP?
The fee for A661 is CAD 86.35, a flat rate under OHIP for complex pediatric re-assessments.
How often can A661 be billed for the same patient?
The billing frequency is governed by the General Preamble assessment rules and not a fixed annual cap for this code.
What conditions typically justify using A661 in pediatrics?
Children with chronic neurological, metabolic, or genetic conditions usually justify the use of A661.
Is A661 applicable for developmental risk management?
Yes, when it involves ongoing management using developmental surveillance approaches, documented three times annually.
Can a pediatrician bill A661 for a telehealth session?
Yes, A661 can be billed for virtual encounters, including video or telephone consultations.
What makes a re-assessment 'complex' for a pediatric patient?
Complexity involves management of multi-system conditions, requiring detailed input and ongoing care modification.
Can A661 be used for initial assessments?
No, A661 is for re-assessments only; initial assessments should use codes A263 or C263.
Disclaimer: This article is intended as a general educational resource for physicians and billing staff. It does not constitute billing advice or a definitive interpretation of the OHIP Schedule of Benefits. Always verify current billing codes, eligibility criteria, and documentation requirements directly against the official Schedule of Benefits or consult with a qualified medical billing specialist.
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