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Welcome to the
MaineCare Partner Portal

Serving the MaineCare population to improve healthcare outcomes

MaineCare is a state and federally funded program that provides healthcare coverage for eligible individuals and families.

Announcements

Maintenance Notice

The regular maintenance windows will be:

  • Ad Hoc Maintenance – October 14, 2026
    The maintenance window is scheduled for 8:00 PM–11:59 PM ET.
  • Recurring Maintenance Windows
    The regular maintenance windows will be:
    • Tuesdays: 7:00 PM–10:00 PM ET
    • Saturdays: 6:00 PM ET–Sunday 12:00 PM ET

504 Error
We are aware that users are receiving a “504 error” when moving between pages on the MaineCare Partner Portal. We are actively working on this issue.

MIHMS Upgrade October Payment Cycle Changes and System Access Limitations

As previously communicated, the Office of MaineCare Services (OMS) is preparing to launch an upgraded version of MIHMS, MaineCare's claims processing system. The upgrade is currently scheduled to go live on October 10, 2026. To support a smooth transition, OMS must implement temporary system access limitations and adjustments to payment cycles in October.  

From Friday, October 2 at 8:00 PM until Monday, October 12 at 8:00 AM, MIHMS will be in a "data freeze" while OMS completes final system readiness and transition activities. 

Please note that we have updated the FAQ previously shared, as of September 14, 2026. 

Changes to October payment cycles: 

Review this information and plan billing accordingly to prepare for the transition.    

Payment Cycle Date Type of Cycle Claim Submission Deadline for Inclusion in Payment Cycle* 
Wednesday, 9/30/26  Last regular payment cycle before the data freeze  Friday, 9/25/26, 5:00 AM 
Thursday, 10/1/26 Extra payment cycle before the data freeze Wednesday, 9/30/26, 5:00 AM 
There will be no payment on Wednesday, October 7. ​​
Thursday, 10/15/26 First payment cycle after data freeze, in upgraded system 

Secure File Transfer Protocol (SFTP) submission: Continuous through data freeze up to Tuesday, 10/13/26, 2:00 PM 

  

Portal submission: 

Before data freeze: Friday, 10/2/26, 7:59 PM 

After data freeze: Tuesday, 10/13/26, 2:00 PM 

Wednesday, 10/21/26 Regular payment cycle, in upgraded system Friday, 10/16/26, 5:00 AM 

  *As always, timely submission does not guarantee that the claim will process in time for the next payment cycle. OMS may take up to 30 days to process and pay a claim, depending on any edits or issues that may cause the claim to pend for manual review, as well as other processing requirements that may require the full 30-day timeframe. 

Preparing for the changes to October payment cycles: 

The HealthPAS Online Portal has returned to its previous regular operating hours. Providers again have 24/7 access to the portal, for additional flexibility and time to submit claims outside of standard business hours.   

We strongly encourage providers to submit claims approaching timely filing limits in the next few weeks to avoid potential submission delays. The planned data freeze does not modify existing Medicaid timely filing requirements. Providers remain responsible for ensuring claims are submitted within the established timely filing guidelines.

Other system access limitations:   

Providers can find other expected impacts of the data freeze in this FAQ. We have updated the FAQ as of September 14, 2026. Topics include: 

  • HealthPAS Online Portal, including impacts on submitting claims, submitting prior authorizations, and checking member eligibility 
  • Provider Enrollment Application (PEA) 
  • Value-Based Purchasing Management System (VMS) Portal 
  • Paper & fax document submissions 
  • Provider Services & Member Services call centers 
  • Value Added Network (VAN) Trading Partners 
  • Prior authorizations for prescriptions and behavioral health services 
  • Electronic Visit Verification (EVV) 
  • Secure File Transfer Protocol (SFTP) 

You can also check the OMS Provider Resources webpage, in the first box of information called "Health PAS Online Portal," for the most recent information about the upgrade.   

For questions or clarifications, please contact Provider Services at 1-866-690-5585. Please note, Provider Services does not have additional information beyond what is shared in this message and in the FAQ linked above. 



Critical Communications from MaineCare: A New E-message Topic List

MaineCare created a new e-message topic list called MaineCare - Critical Communications. We will utilize this list solely to share information when circumstances disrupt provider operations. Subscribe to the new MaineCare - Critical Communications list today!  

Prior to sending a critical message, we will also update the emails from all other subscription lists. If you unsubscribe, we cannot add your email back.  

For more information about the purpose of the new topic list, examples of critical communications, and how we use all other topic lists, see the e-message from April 15, 2025.​



  • General
  • Provider
Welcome to the Partner Portal for MaineCare members and service providers!
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MaineCare Services coordinates the programs and benefits, assures that they operate under consistent policy in keeping with the Department’s goals and federal mandates, and ensures that they are administered effectively and efficiently. By doing so, MaineCare Services assures the highest quality outcomes for its members through measurement, a well-informed workforce and an efficient, sustainable, and integrated health delivery system.
Members
MaineCare Members:

  • MaineCare members should visit MaineCare.gov and the Member Resources webpage for information about the MaineCare program and how to access a letter of creditable coverage and claims history report.
Providers / Trading Partners
Log in to the provider secure portal to:

  • View Medicaid eligibility and history
  • Submit claims
  • Submit authorization requests
  • Check document status
  • Resume provider enrollment application
  • Check provider enrollment application status


Event Calendar

Keep in Mind

1. Reminder: Adjustment of Medicaid Expansion Claims

For MaineCare to properly identify claims for Medicaid expansion members, if member eligibility information changes after the claim has been submitted, we may adjust the claims for those members. When members' eligibility changes, claims paid prior to the updates may be re-processed, claims that denied previously may pay, and others will have no payment impact but will be updated for tracking and fund allocation purposes. No provider action is needed.

2.  Home Health Agencies (HHA) and Durable Medical Equipment (DME): Surety Bonds

All HHA and DME providers are required to provide surety bonds to MaineCare when enrolling as a new provider, revalidating enrollment, or adding a new service location. The surety bond must name the DME or HHA provider as Principal, MaineCare as the Obligee, and the surety company as Surety. The surety's name, street address or post office box number, city, state, and zip code must be included. The bond must also contain the service location name and address.
The bond must contain appropriate guarantees for payment to MaineCare to cover uncollected overpayments and liability for unpaid claims that are identified during the term of the bond, regardless of when the overpayments took place.
The bond must be in the amount of:

  • HHA providers: The greater of $50,000 or 15% of Annual Medicaid Payment based on previous fiscal year per service location.
  • DME providers: An amount of no less than $50,000 per National Provider Identifier (NPI). An additional $50,000 bond is required for each adverse legal action you've had within the past 10 years.
Surety bonds that do not meet these requirements established by the Affordable Care Act (ACA) could delay the initiation of your revalidation application.

3.  Encounter Services Required When Billing T1015 Reminder

This is a reminder that RHC, FQHC, Indian Health, and School Health Center providers who bill T1015 are required to provide all encounter services related to the claim. Claims submitted with T1015 and no encounter services will be denied. The claim will also deny if all encounter services on the claim are not covered by MaineCare.

4.  Dental Services Providers Enrolling Dentists/Physicians, CR 82105
 
A new provider type/specialty combination has been created called 51 Physician/029 Dentist-General. This combination must be used whenever a licensed dentist, who is also a licensed physician, is enrolled in MIHMS as a provider. The combination should be used when enrolling Pay-To providers; rendering providers; and Non-billing Ordering, Prescribing, and Referring (NOPR) providers. The change will allow the dentist/physician to submit claims for both dental and physician services. Selecting a dental provider type to enroll a dentist/physician will result in incorrect reimbursement.

5.  Enrollment Backdate Requests

Effective November 1, 2020, providers will have 180 days from when they complete their enrollment to clear up any backdated items that were not in effect on the requested date during the enrollment submission process. For example, if a specific effective date of August 3, 2020 had been requested at the onset of enrollment, but the system did not set the date as requested in the initial case submission, providers will have 180 days from the enrollment case completion date to request a correction to the date of August 3, 2020 to match the initial request within the case. If this does not occur within 180 days, the request will not be honored.

6.  Attention All Providers: Updating Your License Under Title 5

The Office of MaineCare Services (OMS) has recently updated the online Provider Enrollment Application (PEA) to allow the use of a Title 5 License Extension to update expired licenses.

Providers whose license is under a Title 5 review may use their Title 5 notice to extend their enrollment with MaineCare in MIHMS by six months and for every six months thereafter until the Title 5 issue is resolved. This update can be completed by a maintenance case via the MaineCare Partner Portal. Please select the "Title 5 License Extension" from the licensing board drop-down menu and complete the maintenance case as usual. Dates to be used are as follows: if you are enrolling and today's date is January 17, 2020, use that date as your "Begin Date," add six months and enter the "Term Date" as January 16, 2020. This process must be repeated every six months until the Title 5 review has been finalized and submitted as soon as you are notified by your licensing board that your license termination date will not be extended.

Providers that have not yet revalidated their enrollment, please be sure to renew your license with your licensing board before the license termination date. Gainwell will follow the internal process to update licenses for providers who have not yet revalidated. Failure to renew your license prior to its expiration will result in no reimbursement for services provided to MaineCare members.

7.  Family Planning Codes and FP Modifier Usage Requirement, CR 97225
Effective November 1, 2020, the Office of MaineCare Services will require providers to bill the FP modifier in conjunction with the family planning procedure codes listed below. This affects MaineCare Benefits Manual Sections 30, 31, 45, 90, 103, and Limited Family Planning.
Claim lines billed with any of the codes below that do not include the FP modifier for dates of service on or after November 1, 2020, will deny. The FP modifier must be the first modifier listed if more than one modifier is required for the claim line.
We recognize that some providers may need to make changes in their billing system to accommodate the use of the FP modifier. While those changes are being made, providers may utilize direct data entry into the MaineCare Partner Portal as an alternative so that claims can still be submitted and processed as appropriate.
Codes that require an FP modifier:
11976
57170
58300
58301
A4266
A4267
A4268
A4269
J1050
J7300
J7301
J7303
J7304
J7307
J7296
J7297
J7298
S4993

8.  Avoid Invalid NDC Code Claim Rejections
There has been an increase in claim rejections for invalid NDC codes. The following information will assist in identifying NDC codes that are not valid.
If you submit an 837 EDI transaction with an invalid NDC code, it will reject the entire claim. You will need to review your rejections on the BRR report to know which NDC code is invalid. A claim with invalid NCD code can be submitted successfully on the MaineCare Partner Portal, but the claim lines with the invalid NDC codes will deny.
NDC codes should be 11 digits long and have a 5 4 2 format (example: 00703-5145-01). When adding NDC codes to your claims, hyphens are not needed, but 11 digits are required.
There are two Medicare crosswalks to validate NDC codes that are used to edit claims in MIHMS. If the code combinations are not on either of these crosswalks, then the claim will not process accurately.

Please see the links for the Medicare crosswalks:


There will be occasions when the HCPC/NDC combination is on one list but not the other. There will always be a delay with keeping both lists current so, the MaineCare uses both lists to validate these combinations. These codes are Date of Service sensitive; therefore, the relationship start and end dates on the PDAC crosswalk matters. When using the Medicare ASP Crosswalk, choose the quarter that includes the Date of Service.  
If claims are denied due to the invalid NDC/HCPCS codes, you can request the combination to be reviewed, and possibly added by using the NDC-J Code Combination Request Form and by emailing the information to MaineCareNDCrequest.DHHS@maine.gov

9.  MaineCare Partner Portal Browser Compatibility
Browser Compatibility—The MaineCare Partner Portal currently supports these web browser versions:

  • Microsoft Edge Chromium 79 or higher
  • Chrome version 38 and newer
  • Safari 10 and newer

Additional browsers and their versions may be compatible but are not officially supported. Support for these browsers will continue to develop over time. Other that what was required by the supported browser and version, users are not required to have any special software or hardware to gain access to the portal. If you have difficulty with browser compatibility or accessing the portal, please contact Provider Services at 1-866-690-5585. Office hours are 7:00 AM EST until 6:00 PM EST.


This Provider Checklist gives you all the steps to be ready to bill in MIHMS.