Margaret I. Stewart, M.D.
Dermatology Physician · Portsmouth, NH
Margaret I. Stewart, M.D. is a dermatology physician with a practice address in Portsmouth, New Hampshire, and NPI 1649375072, issued on Sep 13, 2006. Check the license (New Hampshire 11839, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Margaret I. Stewart
- Credential
- M.D.
- Primary taxonomy
- Dermatology Physician 207N00000X
- License numbers
- 11839 NH
159113 MA
Self-reported in NPPES; status is on the state search - Practice location
- 155 Borthwick Ave, Portsmouth, NH 03801
- Phone
- (603) 433-9575
- Enumerated
- Sep 13, 2006
- Record last updated
- Oct 18, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (603) 430-0104
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 89 in New Hampshire → Look up another NPI →
Also registered at 155 Borthwick Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Claudia Bartolini, MDOphthalmology Physician1497071096
- Ian Bier, ND., LAC, PHDNaturopath1285959627
- Stephen Brady, M.D.Dermatopathology Physician1194820662
- Richard Chace, M.D.Specialist1912900077
- Molly Chartier, M.D.Dermatology Physician1922245471
- Daniel Davies, DOInternal Medicine Physician1083683833
Verify Margaret I. Stewart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 11839Check 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: $42.00
1 payment: grant; the largest payer was Abbvie Inc. The 10,250 providers of this specialty with any payment received $8,544.61 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.
Margaret I. Stewart among 89 dermatology physician records in New Hampshire
Margaret I. Stewart, M.D. is one of 89 dermatology physician records with a practice address in New Hampshire. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 56% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2017 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in New Hampshire
There are 89 dermatology physician records in New Hampshire.
All 89 in New Hampshire → Every provider in Portsmouth → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Hagger Ali, MDPortsmouth, NH 038011396107579
- Molly Chartier, M.D.Portsmouth, NH 038011922245471
- James Dinulos, M.D.Portsmouth, NH 038011023037579
- Jonathan Glass, MDPortsmouth, NH 038011164622981
- Abel Jarell, MDPortsmouth, NH 038011275669996
- Arthur Marka, MDPortsmouth, NH 038011538798541
- Warren Pringle, MDPortsmooth, NH 038011487745782
- Lisa Sherman, MDPortsmouth, NH 038011043245046
Common questions
What is Margaret I. Stewart, M.D.'s NPI number?
Margaret I. Stewart, M.D.'s National Provider Identifier (NPI) is 1649375072, issued on Sep 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Margaret I. Stewart, M.D. located?
The NPPES record lists a practice address at 155 Borthwick Ave, Portsmouth, NH, 03801. Phone: (603) 433-9575. Providers update this record themselves, so call before visiting.
How can I verify Margaret I. Stewart, M.D.'s license?
NPPES lists New Hampshire license number 11839, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. 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.