GREGORY N. MATWIYOFF M.D. – NPI #1932248093
Internal Medicine
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.
GREGORY MATWIYOFF is a physician located in RENO, NV. NPPES has assigned the NPI number 1932248093 to GREGORY MATWIYOFF on February 05, 2007. It is a Type-1 NPI, indicating this NPI number is associated with an individual. With multiple taxonomy codes selected, the primary taxonomy selected by this provider is 207RP1001X from the Health Care Provider Taxonomy code set, which is classified as Internal Medicine, specializing in Pulmonary Disease
The NPI profile was last updated on Mar 05, 2026. Use the NPI data found here to bill health insurance companies, identify providers enrolled in Medicare and Medicaid services or other HIPAA compliant transactions. See the complete NPI profile for GREGORY MATWIYOFF below.
NPI Profile for
GREGORY N. MATWIYOFF
(more than 19 years ago)
RENO, NV 89502-1198 Phone: (775) 982-5000 Fax: (775) 982-3900
1 Other location(s):
Reno, NV 89521-4832
Phone: (775) 982-5000
Fax: (775) 982-3900
MS M-14
RENO, NV 89502-1576 Phone: (775) 982-5262 Fax: (775) 982-3900
Note: NPPES allows providers to attest to the accuracy of their NPI data. When a provider request any change to the NPI record, they will be able to attest to their changed NPI data, resulting in an updated certification date.
Identifiers for GREGORY MATWIYOFF
Identifiers are used to associate other provider identifiers such as Medicaid or other insurers (ie:, Blue Cross, Blue Shield, Aetna, Kaiser-Permanente, etc.), with their NPI number. These identifiers can be used in matching an NPI number to an insurer's records. However, not all providers have such numbers and not all providers choose to include them in their NPI information.
| Description | Issuer | State | Identifier |
|---|---|---|---|
| other | DOD | VAD0000 |
A taxonomy code is a code that describes the health care service provider's type, classification, and the area of specialization. The primary specialty for this provider is indicated as (Primary) below.
| Taxonomy Classification / Specialization | State | License |
|---|---|---|
| 207RP1001X - Internal Medicine / Pulmonary Disease (Primary) |
NV | 25119 |
| 207RS0012X - Internal Medicine / Sleep Medicine |
NV | 25119 |
| 207RC0200X - Internal Medicine / Critical Care Medicine |
NV | 25119 |
The taxonomy codes are selected by the provider at the time of NPI registration. Selection of a taxonomy code does not replace any credentialing or validation process that the provider requesting the code should complete.
Additional Information
- Refer to Part B
- Order Durable Medical Equipment
- Refer to Home Health Agency
- Order Power Mobility Devices
Why is my NPI data (personal information) being displayed publicly?
If you have an active NPI profile, your profile is required to be disclosed according to the FOIA and eFOIA. HIPAA also requires covered providers to share their NPI with other providers, health plans, clearinghouses and any entity that may need it for billing purposes.
How do I correct or change the NPI data displayed here?
At any time, providers can make changes to their NPI profile at NPPES. Login to NPPES to make changes online or call (800) 465-3203 for assistance. Changes made at NPPES will be reflected on this web site within a few days.
Can I hide my NPI profile from the public?
Unfortunately, No. The NPPES discloses health care provider data under the Freedom of Information Act to the public, which means anyone may request such information directly from the National Plan & Provider Enumeration System.
See the complete CMS Data Dissemination Notice here.