Dr. Margaret I. Stewart, MD
- Medicare services, 2019
- 687
- Part D claims, 2019
- 76
- Industry payments
- $1,649
- State licenses
- 2
- Year NPI issued
- 2006
- Practice address
- 155 Borthwick Ave, Portsmouth, NH 03801-7156
- Practice phone
- Call (603) 433-9575
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Stewart's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Margaret I. Stewart is a dermatologist in Portsmouth, New Hampshire
Dr. Stewart practices in Portsmouth, New Hampshire.
Dr. Stewart's NPI, 1649375072, was assigned on September 13, 2006. Dr. Stewart holds New Hampshire license 11839.
- NPI
- 1649375072NPI Registry (opens in a new tab)
- NPI enumeration date
- September 13, 2006
- NPI status
- Active
- Practice phone
- (603) 433-9575
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Margaret I. Stewart's practice address is in Portsmouth, New Hampshire
Dr. Stewart's practice address in the NPI Registry is 155 Borthwick Ave, Portsmouth, NH 03801-7156. The practice phone is (603) 433-9575.
- NPI Registry address155 Borthwick Ave, Portsmouth, NH 03801-7156Phone(603) 433-9575
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Margaret I. Stewart's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Stewart practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Stewart's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Margaret I. Stewart is one of 73 dermatologists in New Hampshire
Dermatology is Dr. Stewart's primary specialty in the NPI Registry, under taxonomy code 207N00000X. Dmand AI has Dr. Stewart's licenses on file in 2 states: New Hampshire and Massachusetts.
Specialties and state licenses
- Dermatology, New HampshirePrimary
- Massachusetts license
Dermatologists near Dr. Stewart
Counts of dermatologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Margaret I. Stewart billed Medicare for 687 services in 2019
CMS data shows 687 Medicare services from Dr. Stewart across 7 procedure codes in 2019. Medicare paid $8,498 for them. Every service was in an office.
Dr. Stewart's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Surgery
- 2018: 6,5422019: 49093%
- Office and hospital visits
- 2018: 2,2352019: 18192%
- Tests and treatments
- 2018: 1392019: 1688%
- Drugs given in the office
- 2018: 272019: 0100%
Dr. Stewart compared with the New Hampshire median for dermatologists, 2019
- Dr. Stewart
- New Hampshire median
- Medicare services
- 687vs 2,41472% below
- Part D claims
- 76vs 52485% below
Medians across 73 dermatologists in New Hampshire with Dmand AI profiles that report each measure.
Dr. Stewart's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Stewart and other dermatologists in New Hampshire.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Margaret I. Stewart's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Stewart's median patient age at 78, with 70% women.
Dr. Stewart's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women70%
- Men30%
Source: Dmand AI Patient Panel Data
Dr. Margaret I. Stewart wrote 76 Medicare Part D claims in 2019
In 2019, Dr. Stewart wrote 76 Medicare Part D claims. Every claim was for a generic drug. They cover 5 drugs, with $3,993 in total drug cost. In 2018, CMS named 541 claims across 16 drugs.
Dr. Stewart's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 5412019: 7686%
Drugs named by CMS: 5 in 2019, 16 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Margaret I. Stewart received $1,649 in industry payments from 2016 to 2024
CMS Open Payments shows 81 general payments to Dr. Stewart from 15 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 97% of the total. LEO Pharma Inc. paid the most, $326.
General payments to Dr. Stewart by program year, 2016 to 2024
General payments to Dr. Stewart by kind, 2016 to 2024
- Food and beverage$1,60797%
- Grants$423%
Companies that paid Dr. Stewart the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Margaret I. Stewart's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Margaret I. Stewart
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Margaret I. Stewart's NPI number?
Dr. Margaret I. Stewart's NPI number is 1649375072. It was assigned on September 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Margaret I. Stewart?
Dr. Margaret I. Stewart is a dermatologist in Portsmouth, New Hampshire. The primary specialty in the NPI Registry is Dermatology Physician (taxonomy code 207N00000X).
Where does Dr. Margaret I. Stewart practice?
Dr. Stewart practices at 155 Borthwick Ave, Portsmouth, NH 03801-7156.
What is Dr. Margaret I. Stewart's office phone number?
The practice phone on file for Dr. Stewart is (603) 433-9575.
What is Dr. Margaret I. Stewart's medical license number?
Dr. Stewart holds New Hampshire license 11839, one of the licenses on file in 2 states.
Which states has Dr. Margaret I. Stewart been licensed in?
Dmand AI has state licenses on file for Dr. Stewart in New Hampshire and Massachusetts.
Does Dr. Margaret I. Stewart accept Medicare?
Yes. CMS data shows Dr. Stewart billed Medicare for 687 services in 2019.
What services does Dr. Margaret I. Stewart bill to Medicare?
In 2019, Dr. Stewart's most billed Medicare services were surgery: skin and soft tissue (17003), office visit, established patient (99213) and surgery: skin and soft tissue (17000).
What drugs does Dr. Margaret I. Stewart prescribe most?
In 2019 Medicare Part D data, Dr. Stewart's most prescribed drugs by claims were Triamcinolone Acetonide, Clobetasol Propionate and Econazole Nitrate.
Has Dr. Margaret I. Stewart received payments from drug or device companies?
CMS Open Payments shows $1,649 in general payments to Dr. Stewart from 15 companies from 2016 to 2024. The largest total came from LEO Pharma Inc.
How long has Dr. Margaret I. Stewart been practicing?
Dr. Stewart's NPI was assigned in 2006.
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