2026 NPPES data Psychiatry Physician NPI 1629263512 M.D.
Verify on CMS →

DON GUIROY, M.D.

Psychiatry Physician in SALINAS, California. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
1K
Medicare Part D claims · 33 beneficiaries · Psychiatry Physician avg: 1K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

DON GUIROY, M.D. filed 1,248 Medicare Part D claims in 2023 as a Psychiatry Physician in SALINAS, California, prescribing 88% generic.

1K
Part D claims, 2023
88%
generic prescribing

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.

DON GUIROY, M.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

1,248 Top 22% higher than 78% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). This entry sits in this band. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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

Board-eligible specialty (heuristic — not verified)

DON GUIROY, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about DON GUIROY, M.D.?

Quality data not reported

NPI registry status

Active

Issued 09/13/2007

NPI 1629263512

Primary specialty

Psychiatry Physician

High-volume

53,104 US NPIs in this specialty

Medicare Part D claims

1,248 20% vs specialty avg

2023 prescription claims

Specialty avg: 1,038

Specialty distribution in California

How Psychiatry Physician compares to other specialties among California providers

California providers

Psychiatry Physician share within California

1. Psychiatry Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Psychiatry Physician share within California

Specialty board-certification context

Estimated specialty board-certified rate — Psychiatry Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Psychiatry Physician ABMS/AOA estimate

Est. board-certified rate (Psychiatry Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Psychiatry Physician) — ABMS / AOA estimate

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).

DON GUIROY, M.D. appears in the CMS NPPES registry as a Psychiatry Physician provider holding M.D. credentials at 1441 CONSTITUTION BLVD BLDG 400, SALINAS, CA, 93906, with a listed phone of (831) 796-1700. NPI 1629263512 was issued on 09/13/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what GUIROY most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 1,248 prescription claims written by this provider, covering 33 Medicare beneficiaries and totaling roughly $535K in drug spend, split 12% brand-name and 88% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Psychiatry Physician is a high-volume specialty nationwide, with 53,104 enrolled providers across 56 states and an average of 1,038 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

1441 CONSTITUTION BLVD BLDG 400
SALINAS, CA 93906

Provider Details

NPI 1629263512
Specialty Psychiatry Physician
Credentials M.D.
Gender Male
NPI Issued 09/13/2007

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 DON GUIROY, M.D.. To verify DON GUIROY, M.D.'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.

Brand vs generic prescribing mix · Typical

DON GUIROY, M.D. — brand share 12.0%
Specialty average (est.)

12% brand-name claims vs 88% generic, on 1,248 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

1,248
Total Claims
$535K
Total Drug Cost
33
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,372
Total Day Supply
38,384
Brand vs Generic
12% brand / 88% generic
Brand Drug Cost
$456K
Generic Drug Cost
$79K

Patient Demographics

Average Patient Age
43.7 years
Avg HCC Risk Score
0.86
Gender Split
42% female / 58% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What DON GUIROY, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Olanzapine
127
Bupropion Hcl Sr
Bupropion Hcl
103
Divalproex Sodium
86
Abilify Maintena
Aripiprazole
78
Haloperidol
75
Quetiapine Fumarate
54
Benztropine Mesylate
52
Risperidone
50
Escitalopram Oxalate
43
Clonazepam
40

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Psychiatry Physician Overview

How DON GUIROY, M.D. fits within the Psychiatry Physician landscape nationally.

53,104
Psychiatry Physician Providers in US
56
States with Psychiatry Physician
1,038
Avg Claims per Provider

DON GUIROY, M.D.'s 1,248 claims are above the specialty average of 1,038.

Nearby Psychiatry Physician Providers in California

Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as GUIROY.

Compare Psychiatry Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is DON GUIROY, M.D.'s specialty?
DON GUIROY, M.D. specializes in Psychiatry Physician and practices in SALINAS, California. Credentials: M.D..
How much does DON GUIROY, M.D. prescribe under Medicare Part D?
In 2023, DON GUIROY, M.D. wrote 1,248 Medicare Part D claims totaling $535K in drug costs for 33 beneficiaries.
Where is DON GUIROY, M.D. located?
DON GUIROY, M.D. is located at 1441 CONSTITUTION BLVD BLDG 400, SALINAS, CA, 93906. Phone: (831) 796-1700.
What is DON GUIROY, M.D.'s NPI number?
DON GUIROY, M.D.'s National Provider Identifier (NPI) is 1629263512, issued on 09/13/2007.
Does DON GUIROY, M.D. prescribe more brand-name or generic drugs?
DON GUIROY, M.D.'s prescribing is 12% brand-name and 88% generic drugs by claim count, with $456K in brand drug costs.
How many Psychiatry Physician providers are there in the US?
There are 53,104 Psychiatry Physician providers across 56 states in the US. The average Psychiatry Physician provider writes 1,038 Medicare Part D claims per year.
What drugs does DON GUIROY, M.D. prescribe most often?
Based on 2023 Medicare Part D data, DON GUIROY, M.D.'s most frequently prescribed drugs include Olanzapine, Bupropion Hcl Sr, Divalproex Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does DON GUIROY, M.D. accept Medicare?
DON GUIROY, M.D. appears in CMS Medicare data with 1,248 Part D claims and 33 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify DON GUIROY, M.D.'s credentials?
DON GUIROY, M.D.'s NPI is 1629263512 with credentials M.D.. 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

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