OHIP Billing Guide🩺 ServicePublished 2026
A638

A638 OHIP Billing Code: Streamline Partial Assessments in Nuclear Medicine

The A638 code allows Nuclear Medicine specialists to conduct and bill for partial assessments, offering a structured approach to efficient patient evaluation.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference48.00 CAD~3 min read

1What Is the A638 OHIP Code?

A partial assessment in Nuclear Medicine involves a limited service focusing on the history of presenting complaints, necessary physical examination, and providing patient advice followed by accurate record-keeping. This assessment often precedes or follows radionuclide therapies, wherein a specific symptom and site are examined. Physicians in Nuclear Medicine might overlook this code if the evaluation involves multiple symptoms or if the scope of the assessment inadvertently expands beyond the partial assessment criteria.

2Related Codes

CodeNameFrequencyDescription
A633Specific assessmentCheck specialty rules for frequencyA comprehensive assessment involving more detailed examination or additional issues.
A631Minor assessmentCheck specialty rules for frequencyA brief assessment that is less complex than a partial assessment.
A632Minor assessmentCheck specialty rules for frequencySimilar to A631, used for very brief evaluations.
A635ConsultationCheck specialty rules for frequencyAn in-depth consultation offering targeted recommendations and comprehensive assessment.

3Eligibility Requirements

Eligibility Requirements for A638

  • Service Components: The assessment must include a history of the presenting complaint, a necessary physical examination, providing advice to the patient, and appropriate record-keeping.
  • Time Recording: Physicians must document start and end times of the service in the patient’s medical record to ensure billing compliance.
  • Virtual Delivery: The assessment can be rendered virtually via video or telephone, billed as A638A, according to the provisions in Appendix J of the OHIP Schedule.

Check the General Preamble assessment rules and specific specialty listing for any per-day or per-patient limits.

4What Your Clinical Note Must Show

1Service Documentation

Essential components for accurate billing include:

  • History of presenting complaint
  • Necessary physical examination
  • Patient advice provided
  • Start and end times recording on the patient's record

5Weak vs. Strong Note Examples

The strong note provides detailed documentation, including specific symptoms, examination details, advice, and accurate timing, ensuring compliance with billing requirements.

Weak Note

Patient presents with chest pain. Discussed symptoms. Advised further testing.

Strong Note

Patient presents with localized chest pain, post-radionuclide therapy. Completed focused examination of the chest area.

Provided advice on managing symptoms post-therapy.

Started: 10:00 AM, Ended: 10:20 AM.

  • Documented time accurately
  • Included specific symptoms and examination details

6Common Reasons This Code Is Missed

1
Incomplete Documentation
Failure to record start and end times or comprehensive notes on the assessment.
2
Scope Creep
Assessment unintentionally expands beyond the "partial" criteria, potentially requiring a different code.
3
Virtual Service Misbilling
Not billing with A638A when service is delivered virtually.
4
Incorrect Code Usage
Misunderstanding the differences between partial and specific or minor assessments.
Document A638 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 A638 under OHIP?
The fee is CAD 48.00, a flat rate for partial assessments.
Can A638 be billed on the same day as other assessments?
Yes, but ensure that different services and criteria justify each billed code according to OHIP rules.
What typical scenario in Nuclear Medicine warrants a partial assessment?
Brief pre or post-radionuclide therapy evaluations focusing on specific symptoms like localized pain.
When might a specific assessment be more appropriate than a partial assessment?
When the examination involves multiple symptoms or comprehensive analysis beyond the partial criteria.
How does a virtual partial assessment differ in documentation?
It should be billed using A638A and documented as if performed in-person with accurate timing noted.
What patient situations justify using the A638 code?
Use A638 when addressing a single symptom, such as assessing symptom management after therapy procedures.
How should a partial assessment be documented in a medical record?
Record the history of presenting complaints, examination details, advice, and timing of service accurately.
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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