Vadim Leyenson, MD
Vadim Leyenson, MD is a Critical Care Medicine (Internal Medicine) Physician in Santa Rosa, CA, registered under NPI 1427052851. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 95 MONTGOMERY DR STE 104, Santa Rosa, CA 95404. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| MD184074 | OR | Critical Care Medicine (Internal… primary |
| 522342 | CA | Critical Care Medicine (Internal… |
| MD184074 | OR | Pulmonary Disease Physician |
| 1107 | CA | Sleep Medicine (Internal Medicine)… |
| MC-1352 | ID | Critical Care Medicine (Internal… |
| 522342 | CA | Pulmonary Disease Physician |
Licences are recorded in 3 states: OR, CA, ID. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Sleep Medicine
- PAC ID
- 7214830298
Enrolled in Medicare 4 times, across 4 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Illinois | I20040128000563 | Practitioner - Sleep Medicine |
| Oregon | I20170830003768 | Practitioner - Pulmonary Disease |
| California | I20191216003002 | Practitioner - Pulmonary Disease |
| Texas | I20211001000549 | Practitioner - Critical Care (intensivists) |
Medicare enrolment is recorded as approved under the provider type Practitioner - Sleep Medicine. There are 4 separate enrolment records across 4 states (IL, OR, CA, TX). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 3 states
This provider holds licences in 3 states: California, Idaho and Oregon. The practice address on file is in Santa Rosa, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 522342
- Specialty
- Critical Care Medicine (Internal…
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Critical Care Medicine covers
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists. NUCC Health Care Provider Taxonomy, code 207RC0200X
All registered taxonomy codes
This provider registers 6 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | MD184074 | OR | primary |
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | 522342 | CA | |
| 207RP1001X | Pulmonary Disease Physician Pulmonary Disease | MD184074 | OR | |
| 207RS0012X | Sleep Medicine (Internal Medicine) Physician Sleep Medicine | 1107 | CA | |
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | MC-1352 | ID | |
| 207RP1001X | Pulmonary Disease Physician Pulmonary Disease | 522342 | CA |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1427052851 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 13, 2005 |
| Last updated | Nov 14, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
95 MONTGOMERY DR STE 104 Santa Rosa, CA 95404 (707) 525-2902 Fax (707) 525-2904 |
| Mailing address |
325 DISTEL CIR Los Altos, CA 94022 |
| Other identifiers |
C154059
· Other (CA) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 4 | 2 | 7 | 0 | 5 | 2 | 8 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 4 | 7 | 0 | 5 | 4 | 8 | 1 |
Sum = 59 · next multiple of 10 = 60 · check digit = 1 · actual last digit = 1
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.