Sean Michael O'Sullivan
Dentist · Owings Mills, MD
Sean Michael O'Sullivan is a dentist with a practice address in Owings Mills, Maryland, and NPI 1710280607, issued on Dec 15, 2010. Check the license (Maryland 11261, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Sean Michael O'Sullivan
- Primary taxonomy
- Dentist 122300000X
- License number
- 11261 MD
Self-reported in NPPES; status is on the state search - Practice location
- 9199 Reisterstown RD, Owings Mills, MD 21117
- Phone
- (410) 365-6500
- Enumerated
- Dec 15, 2010
- Record last updated
- Dec 20, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (410) 365-3214
- Entity
- Type 1 · individual
8 nearest dentist records → All 1,870 in Maryland → Look up another NPI →
Also registered at 9199 Reisterstown RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kelly-Marie Betts, DDSGeneral Practice Dentistry1093237877
- Kimberly Briscoe, LCMFTMarriage & Family Therapist1346475852
- Beatrice Brown, LGPCMental Health Counselor1609665819
Verify Sean Michael O'Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license 11261Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average dentist in 2024
25 Medicare Part D claims for 22 beneficiaries, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amoxicillin18 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Sean Michael O'Sullivan among 1,870 dentist records in Maryland
Sean Michael O'Sullivan is one of 1,870 dentist records with a practice address in Maryland. 60% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 47% of them.
- NPI issued2010 · 47% of these records are older, 49% newer
- In a Medicare fileYes · 60% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2010 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 dentist records list a practice address in Owings Mills
They are 25 of the 1,586 NPPES records with a practice address in Owings Mills, and 1,870 dentist records in Maryland.
All 1,870 in Maryland → Every provider in Owings Mills → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Jessica Baker, DDSOwings Mills, MD 211171891965414
- Joseph Brannon, D.D.S.Owings Mills, MD 211171871887521
- Charles FineOwings Mills, MD 211171265498893
- Scott Lever, DDSOwings Mills, MD 211171427014042
- Marshall Madow, D.D.S.Owings Mills, MD 211171740412220
- Carbra McDonnellOwings Mills, MD 211171912200759
- Cheryl Moss, DDSOwings Mills, MD 211171598967721
- Steven Nachman, DDSOwings Mills, MD 211171720139504
Common questions
What is Sean Michael O'Sullivan's NPI number?
Sean Michael O'Sullivan's National Provider Identifier (NPI) is 1710280607, issued on Dec 15, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Sean Michael O'Sullivan located?
The NPPES record lists a practice address at 9199 Reisterstown RD, Owings Mills, MD, 21117. Phone: (410) 365-6500. Providers update this record themselves, so call before visiting.
How can I verify Sean Michael O'Sullivan's license?
NPPES lists Maryland license number 11261, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does Sean Michael O'Sullivan prescribe under Medicare Part D?
In 2024, Sean Michael O'Sullivan had 25 Medicare Part D claims for 22 beneficiaries; the average among dentist prescribers was 86. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.