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Page Header Graphic: ICD-10, International Classification of Diseases, Tenth Revision

The U.S. Department of Health & Human Services released a final rule that includes the new ICD-10 compliance date of 10/1/15. This final rule implements Section 212 of the Protecting Access to Medicare Act of 2014 by changing the compliance date for the International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) and Procedure Coding System (ICD-10-PCS) from 10/1/14 to 10/1/15. It also requires the continued use of the International Classification of Diseases, 9th Revision, Clinical Modification, Volumes 1 and 2 (diagnoses), and 3 (procedures) (ICD-9-CM) through September 30, 2015. The final rule was published in the Federal Register on August 4, 2014 and is available here.

All Ohio Medicaid providers using ICD-9 on a claim today will be required to use ICD-10 on a claim starting 10/1/15. There is no transition period; 10/1/15 is a hard date for compliance. The compliance date is based on: date of service for outpatient and professional services and date of discharge for inpatient hospital services. ICD-9 codes will continue to be used on claims with dates of service/discharge prior to 10/1/15. Providers cannot bill ICD-9 and ICD-10 codes on the same claim; only one code set per claim will be accepted into MITS. If your organization typically bills span dates and your span crosses the 10/1/15 compliance date, break the claim into two claims: one claim through September 30, 2015, and another claim from October 1, 2015 to last date of span. Paid claims that need adjusted will follow the same compliance date guidelines. If the claim is originally filed with the date of service/discharge prior to 10/1/15, ICD-9 will be required. If the claim is originally filed with the date of service/discharge on or after 10/1/15, ICD-10 will be required. Prior authorization requests that will span the 10/1/2015 compliance date will accept ICD-10 codes prior to 10/1/2015. If your organization submits claims directly to Ohio Medicaid’s MITS web portal, please be sure to select the appropriate ICD version indicator (ICD-9 or 10). Claims that do not use the ICD-10 codes for dates of service/discharge on or after 10/1/2015 will deny.

Please prepare your organization for the transition to ICD-10 now. If your organization is interested in testing with Ohio Medicaid, please contact our ICD-10 testing team at: MITS_CGTESTING@medicaid.ohio.gov. Testing information for trading partners is available here.

Continue to visit this webpage for updates related to ICD-10 implementation in Ohio.

ICD-9 vs. ICD-10

International Classification of Disease (ICD) codes are used in virtually every healthcare setting, including inpatient and outpatient hospital settings and physician offices as well as in professional, medical services.  As the 10th edition, ICD-10 will replace the current ICD-9 code set.  All HIPAA covered entities are required to comply with the new code set regulations. 

Claims for all health care services on or after October 1, 2015 and inpatient hospital with date of discharge on or after October 1, 2015 must use ICD-10 diagnosis & inpatient procedure codes.

ICD-10 offers a number of benefits to Ohio Medicaid, some of which include:  

  • Enhanced code specificity,
  • Improved ability to measure the quality of health care services.
  • Enhanced accuracy of data analytics and reporting.
  • Improved processes to identify fraud and abuse.
  • Improved ability to identify populations and members for targeted outreach and case management.
Code Change Graph: ICD9 versus 1CD10

Remediation and Testing

Ohio Medicaid is on schedule to meet the ICD-10 implementation compliance date of October 1, 2015. Remediation of the impacts to policies and processes is in progress. Ohio Administrative Code rules and policies are being updated to use the appropriate ICD-10 terminology and/or codes. Systems remediation is completed and the project has moved into the testing phase.  Ohio Medicaid continues to be actively engaged with sister state agencies, managed care plans, trading partners, and many provider associations to ensure all Ohio Medicaid Partners will be ready for the transition to ICD-10 on October 1, 2015.

End-to-end testing in Ohio Medicaid’s CERT region is available now; testing in this environment is being used to verify that inbound and outbound transactions have been processed correctly. Information regarding this type of testing is available here.

If you have questions regarding Ohio Medicaid’s ICD-10 implementation project, please e-mail the ICD-10 project team at icd10questions@medicaid.ohio.gov.


For additional information to help you prepare for the transition from ICD-9 to ICD-10, CMS has developed several implementation handbooks. Each guide provides detailed information for planning and executing the transition. To view the guides, please visit: http://www.cms.gov/Medicare/Coding/ICD10/ProviderResources.html.

Visit Ohio Medicaid's ICD-10 Resources web page for additional information.