Mark Welch, D.O.
NPI 1225063555 · Psychiatry Physician · Loma Linda, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Welch, D.O. is a Psychiatry Physician provider in Loma Linda, CA (NPI 1225063555).
Provider details
- NPI number
- 1225063555
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 2OA8950 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
474 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 161 | $131 |
| Sleep Study Including Heart Rate, Breathing, Airflow, and Effort95806 | 103 | $43 |
| Sleep Study in Sleep Lab With Continuous Airway Pressure (6 Years Or Older)95811 | 75 | $122 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 61 | $94 |
| Sleep Study in Sleep Lab (6 Years Or Older)95810 | 42 | $117 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Zolpidem Tartrate | 107 | 18 |
| Clonazepam | 56 | — |
| Trazodone Hcl | 52 | 13 |
| Duloxetine Hcl | 48 | 13 |
| Quetiapine Fumarate | 47 | — |
| Lorazepam | 40 | 12 |
| Sertraline Hcl | 38 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$88 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-12
- Last updated
- 2008-09-25
Frequently asked questions
- What is Mark Welch's NPI number?
- Mark Welch's National Provider Identifier (NPI) is 1225063555, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Welch's specialty?
- Mark Welch is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Welch located?
- Mark Welch's practice location on file with NPPES is 11374 Mountain View Ave, Loma Linda, CA 92354-3830.
- What is Mark Welch's phone number?
- The practice phone number listed in the NPPES registry for Mark Welch is (909) 558-6094.
- Does Mark Welch accept Medicare?
- Mark Welch is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Welch's NPI active?
- Yes — Mark Welch's NPI (1225063555) is active in the NPPES registry as of the last update on 2008-09-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.