Richard G. Lasslo, MD
Internal Medicine Physician · Vacaville, CA
Richard G. Lasslo, MD is an internal medicine physician with a practice address in Vacaville, California, and NPI 1467526780, issued on Nov 20, 2006. Check the license (California A81021, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Richard G. Lasslo
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A81021 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Quality Dr, Vacaville, CA 95688
- Phone
- (707) 453-5000
- Enumerated
- Nov 20, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20051229000794); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1 Quality Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Richard G. Lasslo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A81021Check 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% more Medicare Part D claims than the average internal medicine physician in 2024
5,261 Medicare Part D claims for 398 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 201 claims were for opioids.
Most prescribed
- Atorvastatin Calcium419 claims
- Levothyroxine Sodium262 claims
- Atenolol194 claims
- Lisinopril181 claims
- Fluticasone Propionate177 claims
- Pantoprazole Sodium157 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.
Bills Medicare through one group practice
- Permanente Medical Group IncVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Richard G. Lasslo among 17,696 internal medicine physician records in California
Richard G. Lasslo, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2001 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
53 internal medicine physician records list a practice address in Vacaville
They are 53 of the 1,903 NPPES records with a practice address in Vacaville, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Vacaville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kyaw Aung, MDVacaville, CA 956881386722114
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- Thomas Fashinell, MDVacaville, CA 956881609926419
- Andleeb Judge, M.D.Vacaville, CA 956881932141124
- Frank Karneges, DOVacaville, CA 956881336220581
- James Lee, MDVacaville, CA 956881134279847
- Morris Li, MDVacaville, CA 956881700964442
Common questions
What is Richard G. Lasslo, MD's NPI number?
Richard G. Lasslo, MD's National Provider Identifier (NPI) is 1467526780, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Richard G. Lasslo, MD located?
The NPPES record lists a practice address at 1 Quality Dr, Vacaville, CA, 95688. Phone: (707) 453-5000. Providers update this record themselves, so call before visiting.
How can I verify Richard G. Lasslo, MD's license?
NPPES lists California license number A81021, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Richard G. Lasslo, MD prescribe under Medicare Part D?
In 2024, Richard G. Lasslo, MD had 5,261 Medicare Part D claims for 398 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.