Guillermo Selim Simon, M.D.
Specialist · Potomac, MD
Guillermo Selim Simon, M.D. is a specialist with a practice address in Potomac, Maryland, and NPI 1598707523, issued on Jun 12, 2006. Check the license (Maryland D0010639, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Guillermo Selim Simon
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- D0010639 MD
Self-reported in NPPES; status is on the state search - Practice location
- 11044 Powder Horn Dr, Potomac, MD 20854
- Phone
- (301) 299-4171
- Enumerated
- Jun 12, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (301) 983-9185
- Entity
- Type 1 · individual
8 nearest specialist records → All 938 in Maryland → Look up another NPI →
Verify Guillermo Selim Simon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license D0010639Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Guillermo Selim Simon among 938 specialist records in Maryland
Guillermo Selim Simon, M.D. is one of 938 specialist records with a practice address in Maryland. 36% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 17% of them.
- NPI issued2006 · 17% of these records are older, 39% newer
- In a Medicare fileNo · 36% of these records are
- In the CMS Doctors and Clinicians fileNo · 23% of these records are
- Record last updated2007 · 72% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 specialist records list a practice address in Potomac
They are 10 of the 497 NPPES records with a practice address in Potomac, and 938 specialist records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 938 in Maryland → Every provider in Potomac → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Vicente Deguzman, MDPotomac, MD 208541548528441
- William Govier, M.D.Potomac, MD 208541104849249
- Andrea MerberPotomac, MD 208541710860903
- Lothlorien RedmondPotomac, MD 208541386512077
- Yolanda Roth, M.D.Potomac, MD 208541730398173
- Maria Steiger, M.D.Potomac, MD 208541295874626
- Merril Stock, MDPotomac, MD 208541659649903
- Shlomo Tanen, M.D.Potomac, MD 208541174562540
Common questions
What is Guillermo Selim Simon, M.D.'s NPI number?
Guillermo Selim Simon, M.D.'s National Provider Identifier (NPI) is 1598707523, issued on Jun 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Guillermo Selim Simon, M.D. located?
The NPPES record lists a practice address at 11044 Powder Horn Dr, Potomac, MD, 20854. Phone: (301) 299-4171. Providers update this record themselves, so call before visiting.
How can I verify Guillermo Selim Simon, M.D.'s license?
NPPES lists Maryland license number D0010639, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity 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. 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.