Irving Smith, DO
NPI 1023206968 · Sleep Medicine (Internal Medicine) Physician · Littleton, NH
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irving Smith, DO is a Sleep Medicine (Internal Medicine) Physician provider in Littleton, NH (NPI 1023206968).
Provider details
- NPI number
- 1023206968
- Entity type
- Individual
- Primary specialty
- Sleep Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 048601 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
18 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propionate | 28 | 19 |
| Solriamfetol Hclbrand: Sunosi | 24 | — |
| Clonazepam | 21 | 11 |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphetamine | 16 | — |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphet Er | 14 | — |
| Desloratadine | 13 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$102 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-10-04
- Last updated
- 2015-08-24
Frequently asked questions
- What is Irving Smith's NPI number?
- Irving Smith's National Provider Identifier (NPI) is 1023206968, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irving Smith's specialty?
- Irving Smith is listed in the NPPES registry with a primary specialty of Sleep Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Irving Smith located?
- Irving Smith's practice location on file with NPPES is 580 St Johnsbury Road, Littleton, NH 03561.
- What is Irving Smith's phone number?
- The practice phone number listed in the NPPES registry for Irving Smith is (860) 364-7029.
- Does Irving Smith accept Medicare?
- Irving Smith is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irving Smith's NPI active?
- Yes — Irving Smith's NPI (1023206968) is active in the NPPES registry as of the last update on 2015-08-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.