Irving S. Smith, DO
Sleep Medicine (Internal Medicine) Physician · Littleton, NH
Irving S. Smith, DO is a sleep medicine (internal medicine) physician with a practice address in Littleton, New Hampshire, and NPI 1023206968, issued on Oct 4, 2007. Check the license on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Irving S. Smith
- Credential
- DO
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- 048601 CT
Self-reported in NPPES; status is on the state search - Practice location
- 580 St Johnsbury Road, Littleton, NH 03561
- Phone
- (860) 364-7029
- Enumerated
- Oct 4, 2007
- Record last updated
- Aug 24, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (860) 364-7079
- Medicare enrollment
- Enrolled (PECOS I20151013000688); accepts Medicare assignment
- Medical or professional school
- Nova Southeastern College Of Osteo Medicine, 2004
- Entity
- Type 1 · individual
8 nearest sleep medicine (internal medicine) physician records → All 9 in New Hampshire → Look up another NPI →
Also registered at 580 St Johnsbury Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Maroon, APRNAdult Health Nurse Practitioner1548988652
- Richard McKenzie, DOFamily Medicine Physician1487776449
Verify Irving S. Smith in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
197 Medicare Part D claims for 62 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Fluticasone Propionate28 claims
- Sunosi24 claims
- Clonazepam21 claims
- Dextroamphetamine-Amphetamine16 claims
- Dextroamphetamine-Amphet Er14 claims
- Desloratadine13 claims
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.
Industry payments in 2024: $101.88
1 payment: food and beverage; the largest payer was Zoll Respicardia, Inc. The 664 providers of this specialty with any payment received $3,724.37 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.
One hospital affiliation
- Weeks Medical CenterLancaster, NH · Critical Access Hospitals
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Sleep Medicine (Internal Medicine) Physician providers in New Hampshire
There are 9 sleep medicine (internal medicine) physician records in New Hampshire.
All 9 in New Hampshire → Every provider in Littleton → Sleep Medicine (Internal Medicine) Physician nationwide →
The 8 sleep medicine (internal medicine) physician records with the nearest ZIP codes
- Joseph Dellavalla, MDBerlin, NH 035701386684439
- Brooke Judd, MDLebanon, NH 037561255409744
- Bianca Lang, M.D.Lebanon, NH 037561912962481
- Adam Sorscher, MDLebanon, NH 037661942241542
- Kanistha Verma, MDDover, NH 038201700190618
- Celia Englander, M.D.Concord, NH 033011063621795
- David Picard, MDConcord, NH 033011891736948
- Anne Magauran, M.D.Exeter, NH 038331790950624
Common questions
What is Irving S. Smith, DO's NPI number?
Irving S. Smith, DO's National Provider Identifier (NPI) is 1023206968, issued on Oct 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Irving S. Smith, DO located?
The NPPES record lists a practice address at 580 St Johnsbury Road, Littleton, NH, 03561. Phone: (860) 364-7029. Providers update this record themselves, so call before visiting.
How can I verify Irving S. Smith, DO's license?
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 Irving S. Smith, DO prescribe under Medicare Part D?
In 2024, Irving S. Smith, DO had 197 Medicare Part D claims for 62 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.