John Flaks, D.O.
Anesthesiology Physician · Baltimore, MD
John Flaks, D.O. is an anesthesiology physician with a practice address in Baltimore, Maryland, and NPI 1366424939, issued on Nov 18, 2005. Check the license (Maryland H0059599, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- John Flaks
- Credential
- D.O.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- H0059599 MD
Self-reported in NPPES; status is on the state search - Practice location
- 3001 S Hanover St, Baltimore, MD 21225
- Phone
- (410) 350-3341
- Enumerated
- Nov 18, 2005
- Record last updated
- Oct 17, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 404715000 MD
- Medicare enrollment
- Enrolled (PECOS I20081204000713); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2000
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 1,253 in Maryland → Look up another NPI →
Also registered at 3001 S Hanover St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Flaks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license H0059599Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $13.25
1 payment: food and beverage; the largest payer was Madrigal Pharmaceuticals. The 17,774 providers of this specialty with any payment received $669.59 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Columbia Outpatient Sedation LLCOlney, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Flaks among 1,253 anesthesiology physician records in Maryland
John Flaks, D.O. is one of 1,253 anesthesiology physician records with a practice address in Maryland. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 85% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2000 · median 2005 among the 813 with a school on file
- Record last updated2008 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
523 anesthesiology physician records list a practice address in Baltimore
They are 523 of the 35,183 NPPES records with a practice address in Baltimore, and 1,253 anesthesiology physician records in Maryland.
All 1,253 in Maryland → Every provider in Baltimore → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Jose Amaya, M.D.Baltimore, MD 212251780666347
- Ali Bader, M.D.Baltimore, MD 212251720060502
- Allan Birenberg, M.D.Baltimore, MD 212251104808989
- Ivona Gostomski, M.D.Baltimore, MD 212251154766558
- Pauline Horn, CRNABaltimore, MD 212251942283023
- Kazmer Jobst, M.D.Baltimore, MD 212251144202714
- Stephanie Kahntroff, MDBaltimore, MD 212251447413406
- Joseph Klaus, MDBaltimore, MD 212251154826816
Common questions
What is John Flaks, D.O.'s NPI number?
John Flaks, D.O.'s National Provider Identifier (NPI) is 1366424939, issued on Nov 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John Flaks, D.O. located?
The NPPES record lists a practice address at 3001 S Hanover St, Baltimore, MD, 21225. Phone: (410) 350-3341. Providers update this record themselves, so call before visiting.
How can I verify John Flaks, D.O.'s license?
NPPES lists Maryland license number H0059599, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.