Mark Arnold Welch, D.O.
Psychiatry Physician · Loma Linda, CA
Mark Arnold Welch, D.O. is a psychiatry physician with a practice address in Loma Linda, California, and NPI 1225063555, issued on Jul 12, 2006. Check the license (California 2OA8950, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Arnold Welch
- Credential
- D.O.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 2OA8950 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11374 Mountain View Ave, Loma Linda, CA 92354
- Phone
- (909) 558-6094
- Enumerated
- Jul 12, 2006
- Record last updated
- Sep 25, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20060830000583); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 11374 Mountain View Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mazna Ahmad, MDInternal Medicine Physician1043475536
- Karen Brandon, P.T.Physical Therapist1053340653
- Nishena CaseyCommunity Health Worker1326813346
- George Christison, M.D.Psychiatry Physician1174548135
- Irene Ciovica, M.D.Child & Adolescent Psychiatry Physician1740479724
- Carlos Fayard, PHDPsychologist1669404737
Verify Mark Arnold Welch in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 2OA8950Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average psychiatry physician in 2024
890 Medicare Part D claims for 93 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Zolpidem Tartrate107 claims
- Clonazepam56 claims
- Trazodone Hcl52 claims
- Duloxetine Hcl48 claims
- Quetiapine Fumarate47 claims
- Lorazepam40 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 85.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $88.21
3 payments; by number, the most common kind was food and beverage; the largest payer was Resmed Corp. The 13,693 providers of this specialty with any payment received $4,954.93 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
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Arnold Welch among 8,673 psychiatry physician records in California
Mark Arnold Welch, D.O. is one of 8,673 psychiatry physician records with a practice address in California. 67% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2003 · median 2005 among the 3,295 with a school on file
- Record last updated2008 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 psychiatry physician records list a practice address in Loma Linda
They are 47 of the 4,863 NPPES records with a practice address in Loma Linda, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Loma Linda → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Michael Christensen, M.D.Loma Linda, CA 923541518081967
- George Christison, M.D.Loma Linda, CA 923541174548135
- Jennifer FerrerLoma Linda, CA 923541821299660
- Teresa Frausto, M.D.Loma Linda, CA 923541992737068
- Leia Gill, M.D.Loma Linda, CA 923541396922605
- Carmen Gonzales-Nate, M.D.Loma Linda, CA 923541063578607
- Lauren Grawert, MDLoma Linda, CA 923541508093543
- Serafin Lalas, M.D.Loma Linda, CA 923541700050515
Common questions
What is Mark Arnold Welch, D.O.'s NPI number?
Mark Arnold Welch, D.O.'s National Provider Identifier (NPI) is 1225063555, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Arnold Welch, D.O. located?
The NPPES record lists a practice address at 11374 Mountain View Ave, Loma Linda, CA, 92354. Phone: (909) 558-6094. Providers update this record themselves, so call before visiting.
How can I verify Mark Arnold Welch, D.O.'s license?
NPPES lists California license number 2OA8950, 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 Arnold Welch, D.O. prescribe under Medicare Part D?
In 2024, Mark Arnold Welch, D.O. had 890 Medicare Part D claims for 93 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
What is Mark Arnold Welch, D.O.'s MIPS final score?
The 2023 MIPS final score is 85.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.