Lauren Demaris, DO
Internal Medicine Physician · Portsmouth, NH
Lauren Demaris, DO is an internal medicine physician with a practice address in Portsmouth, New Hampshire, and NPI 1124640107, issued on May 12, 2020. Check the license (New Hampshire 25384, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Lauren Demaris
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 25384 NH
Self-reported in NPPES; status is on the state search - Practice location
- 333 Borthwick Ave Ste 100, Portsmouth, NH 03801
- Phone
- (603) 436-5110
- Enumerated
- May 12, 2020
- Record last updated
- Jul 31, 2024
- Medicare enrollment
- Enrolled (PECOS I20241105002755); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 673 in New Hampshire → Look up another NPI →
Also registered at 333 Borthwick Ave Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lauren Abbott, MDInternal Medicine Physician1619597234
- Mamdooh Al-Nassirat, MDStudent in an Organized Health Care Education/Training Program1821915661
- Myles Allen, MBCHBStudent in an Organized Health Care Education/Training Program1659130292
- Getey Anwar, DOStudent in an Organized Health Care Education/Training Program1487413902
- Jack Bailey, DOStudent in an Organized Health Care Education/Training Program1942902523
- Ahmad Behzadpour, MDInternal Medicine Physician1508568312
Verify Lauren Demaris in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 25384Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
48 Medicare Part D claims for 23 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through 3 group practices
- Hospital Medicine Services OF NH, LLCPortsmouth, NH
- New Creation Healing Center, IncKingston, NH
- Vantage Healthcare LLCManchester, NH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lauren Demaris among 673 internal medicine physician records in New Hampshire
Lauren Demaris, DO is one of 673 internal medicine physician records with a practice address in New Hampshire. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 85% of them.
- NPI issued2020 · 85% of these records are older, 10% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2020 · median 2005 among the 443 with a school on file
- Record last updated2024 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 internal medicine physician records list a practice address in Portsmouth
They are 37 of the 1,860 NPPES records with a practice address in Portsmouth, and 673 internal medicine physician records in New Hampshire.
All 673 in New Hampshire → Every provider in Portsmouth → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jonathan Bridges, M.D.Newington, NH 038011083744510
- Thomas Clairmont, MDPortsmouth, NH 038011053415794
- Daniel Davies, DOPortsmouth, NH 038011083683833
- Gary Fagin, M.D.Portsmouth, NH 038011376518886
- Diane Flamburis, MDPortsmouth, NH 038011851367387
- Mark Henschke, DONewington, NH 038011922092667
- Sunila Jo, MDPortsmouth, NH 038011740290097
- Paris Khavari, MDPortsmouth, NH 038011790889434
Common questions
What is Lauren Demaris, DO's NPI number?
Lauren Demaris, DO's National Provider Identifier (NPI) is 1124640107, issued on May 12, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Lauren Demaris, DO located?
The NPPES record lists a practice address at 333 Borthwick Ave Ste 100, Portsmouth, NH, 03801. Phone: (603) 436-5110. Providers update this record themselves, so call before visiting.
How can I verify Lauren Demaris, DO's license?
NPPES lists New Hampshire license number 25384, 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.
How much does Lauren Demaris, DO prescribe under Medicare Part D?
In 2024, Lauren Demaris, DO had 48 Medicare Part D claims for 23 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.