DR. ION DAN GROSU M.D.
NPI 1255573242
Hospitalist in Bangor, ME
About Dr. Ion Dan Grosu M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ION DAN GROSU M.D. (NPI 1255573242) is an individual hospitalist provider in Bangor, Maine, licensed in Maine (MD19240) and active in the NPI registry since April 2009. He is enrolled in Medicare PECOS, is affiliated with Northern Light Eastern Maine Medical Center, and is a graduate of Other (2001).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
Dr. Ion Dan Grosu M.d. 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 Reassignment
Medicare enrollment records show Ion Grosu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Bangor, ME 04401
- Reassigned Medicare billing, Maine enrollment
- 788 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 5
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 Eastern Maine Medical Center
Acute Care Hospitals · Bangor, MENorthern Light Mayo Hospital
Critical Access Hospitals · Dover Foxcroft, MEPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 04401 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Ion Grosu's NPI number?
The NPI number for Ion Grosu is 1255573242. It was assigned to this individual provider in the NPPES registry on April 6, 2009.
Where is Ion Grosu located?
Ion Grosu practices at 489 State St, Bangor, ME 04401. The listed phone number is (207) 973-7000.
What is Ion Grosu's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Ion Grosu enrolled in Medicare?
Yes. Ion Grosu 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 organization bills Medicare for Ion Grosu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ion Grosu reassigns Medicare benefits to Eastern Maine Medical Center (Bangor, ME). The 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 Ion Grosu's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ion Grosu accept?
Health plans from Anthem Blue Cross and Blue Shield list Ion Grosu as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Ion Grosu affiliated with any hospitals?
According to CMS data, Ion Grosu is affiliated with Northern Light Eastern Maine Medical Center and Northern Light Mayo Hospital.
When was this NPI record last updated?
The NPPES record for Ion Grosu was last updated on October 19, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Dr. Ion Dan Grosu, M.D. · NPI 1255573242
Hospitalist physician in Bangor, Maine. Individual provider, active in the CMS NPPES registry since April 6, 2009.
## Identity
- **NPI:** 1255573242 (Entity type: Individual)
- **Enumerated:** April 6, 2009
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** MD19240 (Maine)
- **Sole proprietor:** No
## Practice location
- **Address:** 489 STATE ST, Bangor, ME 04401-6616
- **Phone:** (207) 973-7000 · **Fax:** (207) 973-5042
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** Eastern Maine Medical Center (NPI 1790789147, Bangor, ME), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2001
## Record status
- **NPPES last updated:** October 19, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1255573242) · Data from the CMS NPPES public registry.