NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1639399280 M.D.
Verify on CMS → David Bostanjian, M.D.
General Practice Physician in Glendale, 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 16,725 in General Practice Physician, 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
10K
Medicare Part D claims · 185 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
88%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
David Bostanjian, M.D. filed 10,050 Medicare Part D claims in 2023 as a General Practice Physician in Glendale, California, prescribing 88% generic.
- 10K
- 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.
David Bostanjian, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
10,050 Top 2% higher than 98% 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
◑
Board-eligible specialty (heuristic, not verified)
David Bostanjian, 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 David Bostanjian, M.D.?
Quality data not reportedPrimary specialty
General Practice Physician
Medicare Part D claims
10,050 250% vs specialty avg
Specialty distribution in California
How General Practice Physician 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 General Practice Physician. 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).
David Bostanjian, M.D. appears in the CMS NPPES registry as a General Practice Physician provider holding M.D. credentials at 410 ARDEN AVE, Glendale, CA, 91203, with a listed phone of (818) 500-8466. NPI 1639399280 was issued on 04/26/2007.
Medicare Part D records for calendar year 2023 show 10,050 prescription claims written by this provider, covering 185 Medicare beneficiaries and totaling roughly $715K in drug spend, split 11% brand-name and 88% generic by claim count, with an opioid prescribing rate of 0.7%.
General Practice Physician is a mid-sized specialty nationwide, with 16,725 enrolled providers across 56 states and an average of 2,872 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 | 1639399280 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/26/2007 |
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 David Bostanjian, M.D.. To verify David Bostanjian, 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
David Bostanjian, M.D. - brand share 11.0%
General Practice Physician average
11% brand-name claims vs 88% generic, on 10,050 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.
10,050
Total Claims
$715K
Total Drug Cost
185
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 11,616
- Total Day Supply
- 336,859
- Brand vs Generic
- 11% brand / 88% generic
- Brand Drug Cost
- $468K
- Generic Drug Cost
- $246K
- Opioid Claims
- 69 (0.7% rate)
- Antibiotic Claims
- 210
Patient Demographics
- Average Patient Age
- 74.9 years
- Avg HCC Risk Score
- 1.31
- Gender Split
- 53% female / 47% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What David Bostanjian, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amlodipine Besylate
Amlodipine Besylate
597 claims
- Losartan Potassium
Losartan Potassium
397 claims
- Atorvastatin Calcium
Atorvastatin Calcium
395 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
387 claims
- Ibuprofen
Ibuprofen
333 claims
- Levothyroxine Sodium
Levothyroxine Sodium
310 claims
- Tamsulosin Hcl
Tamsulosin Hcl
285 claims
- Metformin Hcl
Metformin Hcl
271 claims
| Drug | Claims |
|---|---|
| Amlodipine Besylate | 597 |
| Losartan Potassium | 397 |
| Atorvastatin Calcium | 395 |
| Rosuvastatin Calcium | 387 |
| Ibuprofen | 333 |
| Levothyroxine Sodium | 310 |
| Tamsulosin Hcl | 285 |
| Metformin Hcl | 271 |
| Diclofenac Sodium | 267 |
| Gabapentin | 265 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Physician Overview
How David Bostanjian, M.D. fits within the General Practice Physician landscape nationally.
16,725
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider
David Bostanjian, M.D.'s 10,050 claims are above the specialty average of 2,872.
Nearby General Practice Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Bostanjian.
Dr. Dalal Aago
MD
El Cajon, CA
Dr. Hessam Aazami
M.D.
Canoga Park, CA
Dr. Kenric Aban
M.D.
Oceanside, CA
Dr. Tahira Abbasi
MD
La Jolla, CA
Dr. Ryan Abbott
M.D.
Los Angeles, CA
Compare General Practice Physician 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 General Practice Physician 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.
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Frequently Asked Questions
What is David Bostanjian, M.D.'s specialty? ▼
David Bostanjian, M.D. specializes in General Practice Physician and practices in Glendale, California. Credentials: M.D..
How much does David Bostanjian, M.D. prescribe under Medicare Part D? ▼
In 2023, David Bostanjian, M.D. wrote 10,050 Medicare Part D claims totaling $715K in drug costs for 185 beneficiaries.
Where is David Bostanjian, M.D. located? ▼
David Bostanjian, M.D. is located at 410 ARDEN AVE, Glendale, CA, 91203. Phone: (818) 500-8466.
What is David Bostanjian, M.D.'s NPI number? ▼
David Bostanjian, M.D.'s National Provider Identifier (NPI) is 1639399280, issued on 04/26/2007.
Does David Bostanjian, M.D. prescribe more brand-name or generic drugs? ▼
David Bostanjian, M.D.'s prescribing is 11% brand-name and 88% generic drugs by claim count, with $468K in brand drug costs.
Does David Bostanjian, M.D. prescribe opioids? ▼
Yes, David Bostanjian, M.D. had 69 opioid claims in 2023 with an opioid prescribing rate of 0.7%.
How many General Practice Physician providers are there in the US? ▼
There are 16,725 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,872 Medicare Part D claims per year.
What drugs does David Bostanjian, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, David Bostanjian, M.D.'s most frequently prescribed drugs include Amlodipine Besylate, Losartan Potassium, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Bostanjian, M.D. accept Medicare? ▼
David Bostanjian, M.D. appears in CMS Medicare data with 10,050 Part D claims and 185 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Bostanjian, M.D.'s credentials? ▼
David Bostanjian, M.D.'s NPI is 1639399280 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
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.