DR. STEPHEN M NILSEN D.O.
NPI 1972589398
Anesthesiology in Nottingham, MD
About Dr. Stephen M Nilsen D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN M NILSEN D.O. (NPI 1972589398) is an individual anesthesiology provider in Nottingham, Maryland, licensed in Maryland (H0058012) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, maintains a secondary practice location in Wye Mills, and is a graduate of New York College Of Osteo Medicine Of New York Institute Of Technology (1994).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
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. Stephen M Nilsen 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
11Medicare enrollment records show Stephen Nilsen reassigns Medicare billing to 11 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Pikesville, MD 21208
- Reassigned Medicare billing, Maryland and District of Columbia enrollments
- Also billed through NPI 1962463265 (District of Columbia)
- 80 clinicians in this Medicare group
Owings Mills, MD 21117
- Reassigned Medicare billing, Maryland enrollment
- 14 clinicians in this Medicare group
Columbia, MD 21045
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 86 clinicians in this Medicare group
Columbia, MD 21046
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 717 clinicians in this Medicare group
Annapolis, MD 21401
- Reassigned Medicare billing, Delaware and Maryland enrollments
- 12 clinicians in this Medicare group
Annapolis, MD 21401
- Reassigned Medicare billing, District of Columbia, Delaware and Maryland enrollments
- 8 clinicians in this Medicare group
Mc Lean, VA 22102
- Reassigned Medicare billing, Maryland and Virginia enrollments
- 25 clinicians in this Medicare group
Prince Frederick, MD 20678
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 196 clinicians in this Medicare group
Midlothian, VA 23113
- Reassigned Medicare billing, Maryland and Virginia enrollments
- 16 clinicians in this Medicare group
Jersey City, NJ 07310
- Reassigned Medicare billing, Delaware enrollment
- 6 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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NOTTINGHAM, MD 21236
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 Stephen Nilsen's NPI number?
The NPI number for Stephen Nilsen is 1972589398. It was assigned to this individual provider in the NPPES registry on December 17, 2005.
Where is Stephen Nilsen located?
Stephen Nilsen practices at 8100 Sandpiper Cir Ste 210, Nottingham, MD 21236. The listed phone number is (855) 527-7246.
What is Stephen Nilsen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Stephen Nilsen enrolled in Medicare?
Yes. Stephen Nilsen 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 Stephen Nilsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Nilsen reassigns Medicare benefits to 11 organizations: Center For Pain Management, LLC (Pikesville, MD), Xenon Health Of Maryland LLC (Owings Mills, MD), Columbia Outpatient Sedation LLC (Columbia, MD), First Colonies Anesthesia Associates, LLC (Columbia, MD), Advanced Pain Management Specialists, LLC (Annapolis, MD) and 6 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 Stephen Nilsen'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 Stephen Nilsen was last updated on June 24, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Stephen M Nilsen, D.O. · NPI 1972589398
Anesthesiology physician in Nottingham, Maryland. Individual provider, active in the CMS NPPES registry since December 17, 2005.
## Identity
- **NPI:** 1972589398 (Entity type: Individual)
- **Enumerated:** December 17, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** H0058012 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 8100 SANDPIPER CIR STE 210, Nottingham, MD 21236-4992
- **Phone:** (855) 527-7246 · **Fax:** (866) 229-5063
## 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:** 11 organizations under Medicare reassignment (form CMS-855R): Center For Pain Management, LLC (NPI 1023355286, Pikesville, MD); Xenon Health Of Maryland LLC (NPI 1497191811, Owings Mills, MD); Columbia Outpatient Sedation LLC (NPI 1588921225, Columbia, MD); First Colonies Anesthesia Associates, LLC (NPI 1740218767, Columbia, MD); Advanced Pain Management Specialists, LLC (NPI 1861418220, Annapolis, MD); and 6 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York College Of Osteo Medicine Of New York Institute Of Technology, class of 1994
## Record status
- **NPPES last updated:** June 24, 2024
- **Other identifiers:** Medicaid 699474101 (MD)
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Source: [NPI Profile](https://npiprofile.com/npi/1972589398) · Data from the CMS NPPES public registry.