NPI registry status
Active
2026 NPPES data Psychiatric Pharmacist NPI 1104020841 PHARMD, PHD
Verify on CMS → Mark Watanabe, PHARMD, PHD
Psychiatric Pharmacist in San Francisco, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 840 in Psychiatric Pharmacist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
222
Medicare Part D claims · 23 beneficiaries · Psychiatric Pharmacist avg: 396
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mark Watanabe, PHARMD, PHD filed 222 Medicare Part D claims in 2023 as a Psychiatric Pharmacist in San Francisco, California.
- 222
- Part D claims, 2023
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Mark Watanabe, PHARMD, PHD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
222 49th percentile higher than 49% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Mark Watanabe, PHARMD, PHD?
Quality data not reportedPrimary specialty
Psychiatric Pharmacist
Medicare Part D claims
222 44% vs specialty avg
Specialty distribution in California
How Psychiatric Pharmacist compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Psychiatric Pharmacist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Mark Watanabe, PHARMD, PHD appears in the CMS NPPES registry as a Psychiatric Pharmacist provider holding PHARMD, PHD credentials at 1380 HOWARD ST RM 130, San Francisco, CA, 94103, with a listed phone of (415) 255-3659. NPI 1104020841 was issued on 06/14/2007.
Medicare Part D records for calendar year 2023 show 222 prescription claims written by this provider, covering 23 Medicare beneficiaries and totaling roughly $20K in drug spend.
Psychiatric Pharmacist is a narrow specialty nationwide, with 840 enrolled providers across 50 states and an average of 396 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1104020841 |
|---|---|
| Specialty | Psychiatric Pharmacist |
| Credentials | PHARMD, PHD |
| Gender | Male |
| NPI Issued | 06/14/2007 |
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Mark Watanabe, PHARMD, PHD. To verify Mark Watanabe, PHARMD, PHD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
222
Total Claims
$20K
Total Drug Cost
23
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 312
- Total Day Supply
- 9,170
- Generic Drug Cost
- $17K
Patient Demographics
- Average Patient Age
- 71.1 years
- Avg HCC Risk Score
- 1.26
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Watanabe, PHARMD, PHD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Aripiprazole
Aripiprazole
38 claims
- Mirtazapine
Mirtazapine
38 claims
- Trazodone Hcl
Trazodone Hcl
23 claims
- Duloxetine Hcl
Duloxetine Hcl
22 claims
- Risperidone 13
Risperidone
13 claims
- Lurasidone Hcl 12
Lurasidone Hcl
12 claims
- Olanzapine 12
Olanzapine
12 claims
| Drug | Claims |
|---|---|
| Aripiprazole | 38 |
| Mirtazapine | 38 |
| Trazodone Hcl | 23 |
| Duloxetine Hcl | 22 |
| Risperidone | 13 |
| Lurasidone Hcl | 12 |
| Olanzapine | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Psychiatric Pharmacist Overview
How Mark Watanabe, PHARMD, PHD fits within the Psychiatric Pharmacist landscape nationally.
840
Psychiatric Pharmacist Providers in US
50
States with Psychiatric Pharmacist
396
Avg Claims per Provider
Mark Watanabe, PHARMD, PHD's 222 claims are below the specialty average of 396.
Nearby Psychiatric Pharmacist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Watanabe.
Amir Afshar
Fresno, CA
Dr. Olivia Albiar
PHARMD
Loma Linda, CA
Dr. Azita Alipour
PHARM.D.
Orange, CA
Dr. Kimberly Appleby
PHARM.D.
Los Angeles, CA
Dr. Lisa Arai
PHARM.D.
San Diego, CA
Compare Psychiatric Pharmacist nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychiatric Pharmacist peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
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How insurance networks affect your costs
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Frequently Asked Questions
What is Mark Watanabe, PHARMD, PHD's specialty? ▼
Mark Watanabe, PHARMD, PHD specializes in Psychiatric Pharmacist and practices in San Francisco, California. Credentials: PHARMD, PHD.
How much does Mark Watanabe, PHARMD, PHD prescribe under Medicare Part D? ▼
In 2023, Mark Watanabe, PHARMD, PHD wrote 222 Medicare Part D claims totaling $20K in drug costs for 23 beneficiaries.
Where is Mark Watanabe, PHARMD, PHD located? ▼
Mark Watanabe, PHARMD, PHD is located at 1380 HOWARD ST RM 130, San Francisco, CA, 94103. Phone: (415) 255-3659.
What is Mark Watanabe, PHARMD, PHD's NPI number? ▼
Mark Watanabe, PHARMD, PHD's National Provider Identifier (NPI) is 1104020841, issued on 06/14/2007.
How many Psychiatric Pharmacist providers are there in the US? ▼
There are 840 Psychiatric Pharmacist providers across 50 states in the US. The average Psychiatric Pharmacist provider writes 396 Medicare Part D claims per year.
What drugs does Mark Watanabe, PHARMD, PHD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Watanabe, PHARMD, PHD's most frequently prescribed drugs include Aripiprazole, Mirtazapine, Trazodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Watanabe, PHARMD, PHD accept Medicare? ▼
Mark Watanabe, PHARMD, PHD appears in CMS Medicare data with 222 Part D claims and 23 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Watanabe, PHARMD, PHD's credentials? ▼
Mark Watanabe, PHARMD, PHD's NPI is 1104020841 with credentials PHARMD, PHD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.