Mark D. Weissig, M.D.
Pulmonary Disease Physician · Fullerton, CA
Mark D. Weissig, M.D. is a pulmonary disease physician with a practice address in Fullerton, California, and NPI 1649266032, issued on Sep 21, 2005. Check the license (California G49175, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark D. Weissig
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- G49175 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2141 N Harbor Blvd, Fullerton, CA 92835
- Phone
- (714) 626-8610
- Enumerated
- Sep 21, 2005
- Record last updated
- Apr 25, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (714) 626-8655
- Medicare enrollment
- Enrolled (PECOS I20040602000712); accepts Medicare assignment
- Medical or professional school
- Duke University School Of Medicine, 1980
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 1,443 in California → Look up another NPI →
Also registered at 2141 N Harbor Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Bradley Borsari, MDInternal Medicine Physician1104826619
- Alison Brown, N.P.Family Nurse Practitioner1396093738
- Ruben Cabral, MDInternal Medicine Physician1568458008
- Carl Chen, M.D.Orthopaedic Hand Surgery Physician1235114950
- Theodoros Daskalakis, MDSurgery Physician1467409250
Verify Mark D. Weissig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G49175Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.7 times the Medicare Part D claims of the average pulmonary disease physician in 2024
5,274 Medicare Part D claims for 788 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D.
Most prescribed
- Trelegy Ellipta439 claims
- Albuterol Sulfate Hfa310 claims
- Prednisone299 claims
- Breztri Aerosphere268 claims
- Montelukast Sodium262 claims
- Furosemide237 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: $345.63
11 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,806 providers of this specialty with any payment received $5,159.88 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.
Bills Medicare through one group practice
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark D. Weissig among 1,443 pulmonary disease physician records in California
Mark D. Weissig, M.D. is one of 1,443 pulmonary disease physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1980 · median 2002 among the 1,061 with a school on file
- Record last updated2013 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in California
There are 1,443 pulmonary disease physician records in California.
All 1,443 in California → Every provider in Fullerton → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- James Hardeman, M.D.Fullerton, CA 928351043399017
- Farhan Khabaz, MDFullerton, CA 928351427159458
- Edward Lawton, M.D..Fullerton, CA 928351801882261
- Louis McNabb, M.D.Fullerton, CA 928351346329323
- Andy Tran, M.D.Fullerton, CA 928351326059882
- Julie Yoo, M.D., M.P.H.Fullerton, CA 928351760742001
- Mohamad Abdelfattah, MDFullerton, CA 928311134539711
- Saadah Alrajab, MDFullerton, CA 928311023050135
Common questions
What is Mark D. Weissig, M.D.'s NPI number?
Mark D. Weissig, M.D.'s National Provider Identifier (NPI) is 1649266032, issued on Sep 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark D. Weissig, M.D. located?
The NPPES record lists a practice address at 2141 N Harbor Blvd, Fullerton, CA, 92835. Phone: (714) 626-8610. Providers update this record themselves, so call before visiting.
How can I verify Mark D. Weissig, M.D.'s license?
NPPES lists California license number G49175, 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 Mark D. Weissig, M.D. prescribe under Medicare Part D?
In 2024, Mark D. Weissig, M.D. had 5,274 Medicare Part D claims for 788 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. 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.