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How to Submit and Adjust Claims to OHA

Learn about Fee-for-Service Billing

Also refer to the provider guidelines for your program and the General Rules.

Find mailing addresses for fee-for-service paper claims and more in the Provider Contacts List.

Yes; enrolled providers can do individual claim submissions using the Oregon Medicaid Provider Portal. Go to our Provider Portal information page to learn more.

Providers can also submit batches of claims using electronic data interchange. Go to our EDI page to learn more.​​

Make sure you bill any other payers first. Then verify eligibility and enrollment to determine if your patient is a current OHP member, and to determine whom to bill—OHA or an OHP health plan.

You can bill using the Oregon Medicaid Provider Portal, electronic data interchange, or commercially available paper claims.

Visit our OHP billing tips page for more information.​​

The Oregon Medicaid Provider Portal will tell you whether OHA will pay or deny your claim as soon as you submit it; however, you will need to wait for your paper remittance advice​ (mailed the week after OHA processes your claim) to find out the exact amount paid.​​

For billing purposes, OHA uses Current Procedural Terminology (CPT)Level II National Codes (HCPCS) and Current Dental Terminology (CDT) procedure codes.

OHA does not cover all valid codes, and OHA may not allow covered codes in all settings. ​

  • Maintain documentation of all services provided that support the fee or rate you bill; the date of service; the individual who provided the service; and any other documentation required by rule, provider guidelines or contract.
  • Use all applicable administrative rules (OARs) to determine if there are any coverage criteria, limitations, restrictions, exclusions or client benefit limitations related to a specific procedure code. OHA bases all reimbursement on client eligibility and covered services.
  • Bill other resources first. In most cases, Medicaid is the payer of last resort. For clients with third-party resources (other insurance, including Medicare), OHA pays their maximum allowed rate or fee, less the TPR payment but not to exceed the maximum allowable rate or fee.

OHA expects providers to bill their usual and customary charges unless otherwise specified in the rules for a specific provider program; for example, OHA pays for some services at acquisition costs only.

Generally, OHA pays the maximum allowed rate or fee, less the TPR payment but not to exceed the maximum allowable rate or fee. Visit the OHP fee schedule page to learn more about maximum allowed rates.​​

NPI is required for all claims.

  • ​When billing OHA, make sure the NPI you bill under is the same one you have reported for your Oregon Medicaid ID. To check your NPI information, contact Provider Enrollment (800-336-6016).
  • To look up the NPI of the ordering, referring, or rendering provider for a claim, use the NPI Registry.

See the Provider Contacts List for mailing addresses. The address depends on the type of claim you are sending OHA.​

Handbooks, Tips, and Step-by-Step Guides

Learn about fee-for-service claim processing, how to bill OHA on paper, and how to bill using the Oregon Medicaid Provider Portal. Use the search field to find resources by topic, keyword or document name. For example:

  • Enter "portal" for resources about submitting web portal claims. 
  • Enter "paper claims" for resources about submitting paper claims.

Quick Links

Professional Claims: Handbook and slides

Institutional Claims: Handbook and slides

Pharmacy Claims: Handbook and slides

Dental Claims: Handbook and slides

Adjusting Claims: Handbook and slides

Federal Resources

Payment Error Rate Measurement (PERM) - Every three years, Oregon Medicaid/CHIP claims are subject to PERM review. Learn what you may be required to do as part of a PERM review.

Medicaid Program Integrity Toolkits - These toolkits explain topics that often result in payment errors for providers.

Stay Informed

Get OHP Provider Updates by text or email.

Also sign up for OHP rule updates:

  • Notices of proposed rulemaking
  • Temporary rules

Important Links