MARIA M OLIVA-HEMKER M.D.
NPI 1306890801
Pediatrics - Pediatric Gastroenterology in Baltimore, MD
About Maria M Oliva-hemker M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIA M OLIVA-HEMKER M.D. (NPI 1306890801) is an individual pediatric gastroenterology provider in Baltimore, Maryland, licensed in Maryland (D39176) and active in the NPI registry since May 2006. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Maria M Oliva-hemker M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Maria Oliva-hemker reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Baltimore, MD 21202
- Reassigned Medicare billing, Maryland enrollment
- 352 clinicians in this Medicare group
Baltimore, MD 21287
- Reassigned Medicare billing, Maryland enrollment
- 4,483 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 21287 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.
BALTIMORE, MD 21287
BALTIMORE, MD 21287
BALTIMORE, MD 21287
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 Maria Oliva-hemker's NPI number?
The NPI number for Maria Oliva-hemker is 1306890801. It was assigned to this individual provider in the NPPES registry on May 20, 2006.
Where is Maria Oliva-hemker located?
Maria Oliva-hemker practices at 601 N Caroline St, Baltimore, MD 21287. The listed phone number is (410) 955-8769.
What is Maria Oliva-hemker's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Gastroenterology, with taxonomy code 2080P0206X.
Is Maria Oliva-hemker enrolled in Medicare?
Yes. Maria Oliva-hemker is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Maria Oliva-hemker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maria Oliva-hemker reassigns Medicare benefits to 2 organizations: Kennedy Krieger Associates (Baltimore, MD) and Johns Hopkins University (Baltimore, MD). 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 Maria Oliva-hemker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Maria Oliva-hemker was last updated on February 5, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Maria M Oliva-Hemker, M.D. · NPI 1306890801
Pediatric Gastroenterology physician in Baltimore, Maryland. Individual provider, active in the CMS NPPES registry since May 20, 2006.
## Identity
- **NPI:** 1306890801 (Entity type: Individual)
- **Enumerated:** May 20, 2006
- **Primary specialty:** Pediatrics - Pediatric Gastroenterology · taxonomy 2080P0206X
- **State license:** D39176 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 601 N CAROLINE ST, Baltimore, MD 21287-0006
- **Phone:** (410) 955-8769
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Kennedy Krieger Associates (NPI 1730998733, Baltimore, MD); Johns Hopkins University (NPI 1295731966, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 5, 2014
- **Other identifiers:** Medicare PIN KR41MC21 (MD); Medicare UPIN E56051 (MD); Medicaid 0070451200 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1306890801) · Data from the CMS NPPES public registry.