NPI registry status
Active
2026 NPPES data Addiction Medicine (Internal Medicine) Physician NPI 1144311044 M.D.
Verify on CMS → Michael Bishara, M.D.
Addiction Medicine (Internal Medicine) Physician in Riverside, 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 553 in Addiction Medicine (Internal Medicine) 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
2K
Medicare Part D claims · 132 beneficiaries · Addiction Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
90%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$270.28
13 payments · CMS Open Payments (Sunshine Act)
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
Michael Bishara, M.D. filed 2,221 Medicare Part D claims in 2023 as a Addiction Medicine (Internal Medicine) Physician in Riverside, California, prescribing 90% generic.
- 2K
- Part D claims, 2023
- 90%
- generic prescribing
- $270.28
- industry payments (Sunshine Act)
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.
Michael Bishara, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,221 Top 15% higher than 85% 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)
Michael Bishara, 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 Michael Bishara, M.D.?
Quality data not reportedPrimary specialty
Addiction Medicine (Internal Medicine) Physician
Medicare Part D claims
2,221 58% vs specialty avg
Specialty distribution in California
How Addiction Medicine (Internal Medicine) 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 Addiction Medicine (Internal Medicine) 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).
Michael Bishara, M.D. appears in the CMS NPPES registry as an Addiction Medicine (Internal Medicine) Physician provider holding M.D. credentials at 6896 MAGNOLIA AVE, Riverside, CA, 92506, with a listed phone of (951) 787-4885. NPI 1144311044 was issued on 09/27/2006.
Medicare Part D records for calendar year 2023 show 2,221 prescription claims written by this provider, covering 132 Medicare beneficiaries and totaling roughly $260K in drug spend, split 9% brand-name and 90% generic by claim count, with an opioid prescribing rate of 1.9%.
Addiction Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 553 enrolled providers across 46 states and an average of 1,403 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 | 1144311044 |
|---|---|
| Specialty | Addiction Medicine (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 09/27/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Michael Bishara, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$270
Largest payer
Braeburn Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Michael Bishara, M.D.. To verify Michael Bishara, 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 · Generic-heavy
Michael Bishara, M.D. - brand share 9.0%
Addiction Medicine (Internal Medicine) Physician average
9% brand-name claims vs 90% generic, on 2,221 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.
2,221
Total Claims
$260K
Total Drug Cost
132
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,429
- Total Day Supply
- 97,983
- Brand vs Generic
- 9% brand / 90% generic
- Brand Drug Cost
- $143K
- Generic Drug Cost
- $116K
- Opioid Claims
- 43 (1.9% rate)
- Antibiotic Claims
- 33
Patient Demographics
- Average Patient Age
- 66.6 years
- Avg HCC Risk Score
- 2.09
- Gender Split
- 52% female / 48% male
- Age Distribution
- <65: 42, 65-74: 65, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Michael Bishara, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Buprenorphine-Nalo…
Buprenorphine-Naloxone
279 claims
- Buprenorphine Hcl 61
Buprenorphine Hcl
61 claims
- Atorvastatin Calcium 60
Atorvastatin Calcium
60 claims
- Lisinopril 59
Lisinopril
59 claims
- Atenolol 55
Atenolol
55 claims
- Amlodipine Besylate 54
Amlodipine Besylate
54 claims
- Ibuprofen 44
Ibuprofen
44 claims
- Gabapentin 43
Gabapentin
43 claims
| Drug | Claims |
|---|---|
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 279 |
| Buprenorphine Hcl | 61 |
| Atorvastatin Calcium | 60 |
| Lisinopril | 59 |
| Atenolol | 55 |
| Amlodipine Besylate | 54 |
| Ibuprofen | 44 |
| Gabapentin | 43 |
| Methocarbamol | 43 |
| Pantoprazole Sodium | 43 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Addiction Medicine (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Addiction Medicine (Internal Medicine) Physician Overview
How Michael Bishara, M.D. fits within the Addiction Medicine (Internal Medicine) Physician landscape nationally.
553
Addiction Medicine (Internal Medicine) Physician Providers in US
46
States with Addiction Medicine (Internal Medicine) Physician
1,403
Avg Claims per Provider
Michael Bishara, M.D.'s 2,221 claims are above the specialty average of 1,403.
Nearby Addiction Medicine (Internal Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Bishara.
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 Addiction Medicine (Internal Medicine) 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 Michael Bishara, M.D.'s specialty? ▼
Michael Bishara, M.D. specializes in Addiction Medicine (Internal Medicine) Physician and practices in Riverside, California. Credentials: M.D..
How much does Michael Bishara, M.D. prescribe under Medicare Part D? ▼
In 2023, Michael Bishara, M.D. wrote 2,221 Medicare Part D claims totaling $260K in drug costs for 132 beneficiaries.
Where is Michael Bishara, M.D. located? ▼
Michael Bishara, M.D. is located at 6896 MAGNOLIA AVE, Riverside, CA, 92506. Phone: (951) 787-4885.
What is Michael Bishara, M.D.'s NPI number? ▼
Michael Bishara, M.D.'s National Provider Identifier (NPI) is 1144311044, issued on 09/27/2006.
Does Michael Bishara, M.D. prescribe more brand-name or generic drugs? ▼
Michael Bishara, M.D.'s prescribing is 9% brand-name and 90% generic drugs by claim count, with $143K in brand drug costs.
Does Michael Bishara, M.D. prescribe opioids? ▼
Yes, Michael Bishara, M.D. had 43 opioid claims in 2023 with an opioid prescribing rate of 1.9%.
How many Addiction Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 553 Addiction Medicine (Internal Medicine) Physician providers across 46 states in the US. The average Addiction Medicine (Internal Medicine) Physician provider writes 1,403 Medicare Part D claims per year.
What drugs does Michael Bishara, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Michael Bishara, M.D.'s most frequently prescribed drugs include Buprenorphine-Naloxone, Buprenorphine Hcl, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Michael Bishara, M.D. accept Medicare? ▼
Michael Bishara, M.D. appears in CMS Medicare data with 2,221 Part D claims and 132 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Michael Bishara, M.D.'s credentials? ▼
Michael Bishara, M.D.'s NPI is 1144311044 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.