MARK M GROHMAN D.O.
NPI 1538393541
Hospitalist in Biddeford, ME
About Mark M Grohman D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK M GROHMAN D.O. (NPI 1538393541) is an individual hospitalist provider in Biddeford, Maine, licensed in Maine (DO2294) and active in the NPI registry since May 2009. He is enrolled in Medicare PECOS, is affiliated with Northern Light Health, and is a graduate of University Of New England, College Of Osteo Medicine (2009).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mark M Grohman D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
7Medicare enrollment records show Mark Grohman reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Biddeford, ME 04005
- Reassigned Medicare billing, Maine enrollment
- Medicare enrollment name: Southern Maine Health Care
- 253 clinicians in this Medicare group
Portland, ME 04102
- Reassigned Medicare billing, Maine enrollment
- 322 clinicians in this Medicare group
Bridgton, ME 04009
- Reassigned Medicare billing, Maine enrollment
- 563 clinicians in this Medicare group
Lewiston, ME 04240
- Reassigned Medicare billing, Maine enrollment
- 920 clinicians in this Medicare group
Rumford, ME 04276
- Reassigned Medicare billing, Maine enrollment
- 544 clinicians in this Medicare group
Bangor, ME 04401
- Reassigned Medicare billing, Maine enrollment
- 54 clinicians in this Medicare group
Machias, ME 04654
- Reassigned Medicare billing, Maine enrollment
- Also billed through NPI 1528087004 (Maine)
- 120 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northern Light Health
Acute Care Hospitals · Portland, MEDown East Community Hospital
Critical Access Hospitals · Machias, MEPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 04005 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BIDDEFORD, ME 04005
BEDDEFORD, ME 04005
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Grohman's NPI number?
The NPI number for Mark Grohman is 1538393541. It was assigned to this individual provider in the NPPES registry on May 5, 2009.
Where is Mark Grohman located?
Mark Grohman practices at One Medical Center Drive, Biddeford, ME 04005. The listed phone number is (207) 283-7000.
What is Mark Grohman's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Mark Grohman enrolled in Medicare?
Yes. Mark Grohman is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mark Grohman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Grohman reassigns Medicare benefits to 7 organizations: Mainehealth (Biddeford, ME), Mercy Hospital (Portland, ME), Bridgton Hospital (Bridgton, ME), Central Maine Medical Center (Lewiston, ME), Rumford Hospital (Rumford, ME) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Grohman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mark Grohman affiliated with any hospitals?
According to CMS data, Mark Grohman is affiliated with Northern Light Health and Down East Community Hospital.
When was this NPI record last updated?
The NPPES record for Mark Grohman was last updated on September 6, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mark M Grohman, D.O. · NPI 1538393541
Hospitalist physician in Biddeford, Maine. Individual provider, active in the CMS NPPES registry since May 5, 2009.
## Identity
- **NPI:** 1538393541 (Entity type: Individual)
- **Enumerated:** May 5, 2009
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** DO2294 (Maine)
- **Sole proprietor:** No
## Practice location
- **Address:** ONE MEDICAL CENTER DRIVE, Biddeford, ME 04005
- **Phone:** (207) 283-7000 · **Fax:** (207) 283-7275
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Mainehealth (NPI 1659392819, Biddeford, ME); Mercy Hospital (NPI 1629078712, Portland, ME); Bridgton Hospital (NPI 1154370153, Bridgton, ME); Central Maine Medical Center (NPI 1689653487, Lewiston, ME); Rumford Hospital (NPI 1205991122, Rumford, ME); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of New England, College Of Osteo Medicine, class of 2009
## Record status
- **NPPES last updated:** September 6, 2013
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Source: [NPI Profile](https://npiprofile.com/npi/1538393541) · Data from the CMS NPPES public registry.