NPI registry status
Active
2026 NPPES data Specialist NPI 1245313683 M.D.
Verify on CMS → Marian Fedak, M.D.
Specialist in Los Angeles, 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 69,608 in Specialist, 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
492
Medicare Part D claims · 15 beneficiaries · Specialist avg: 1K
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Marian Fedak, M.D. filed 492 Medicare Part D claims in 2023 as a Specialist in Los Angeles, California, prescribing 84% generic.
- 492
- Part D claims, 2023
- 84%
- 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.
Marian Fedak, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
492 Top 38% higher than 62% 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 Marian Fedak, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
492 67% vs specialty avg
Specialty distribution in California
How Specialist 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 Specialist. 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).
Marian Fedak, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 1700 E CESAR E CHAVEZ AVE, Los Angeles, CA, 90033, with a listed phone of (323) 264-4114. NPI 1245313683 was issued on 10/21/2006.
Medicare Part D records for calendar year 2023 show 492 prescription claims written by this provider, covering 15 Medicare beneficiaries and totaling roughly $23K in drug spend, split 16% brand-name and 84% generic by claim count.
Specialist is a high-volume specialty nationwide, with 69,608 enrolled providers across 55 states and an average of 1,474 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 | 1245313683 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 10/21/2006 |
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 Marian Fedak, M.D.. To verify Marian Fedak, 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
Marian Fedak, M.D. - brand share 16.0%
Specialist average
16% brand-name claims vs 84% generic, on 492 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.
492
Total Claims
$23K
Total Drug Cost
15
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 493
- Total Day Supply
- 8,621
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $16K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 82.9 years
- Avg HCC Risk Score
- 1.99
- Age Distribution
- <65: 0, 65-74: N/A, 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 Marian Fedak, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Metformin Hcl
Metformin Hcl
47 claims
- Eliquis
Eliquis
42 claims
- Incruse Ellipta
Incruse Ellipta
30 claims
- Amlodipine Besylate
Amlodipine Besylate
28 claims
- Labetalol Hcl
Labetalol Hcl
25 claims
- Sertraline Hcl
Sertraline Hcl
25 claims
- Gabapentin
Gabapentin
24 claims
- Benztropine Mesylate
Benztropine Mesylate
23 claims
| Drug | Claims |
|---|---|
| Metformin Hcl | 47 |
| Eliquis Apixaban | 42 |
| Incruse Ellipta Umeclidinium Bromide | 30 |
| Amlodipine Besylate | 28 |
| Labetalol Hcl | 25 |
| Sertraline Hcl | 25 |
| Gabapentin | 24 |
| Benztropine Mesylate | 23 |
| Divalproex Sodium | 22 |
| Levetiracetam | 21 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Marian Fedak, M.D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Marian Fedak, M.D.'s 492 claims are below the specialty average of 1,474.
Nearby Specialist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Fedak.
Adrienne Abad Santos
San Francisco, CA
Dr. Brenda Abarca
MD
Torrance, CA
Dr. Fatemeh Abbasi
PT
Van Nuys, CA
Dr. Erlinda Abcede
M.D.
Cudahy, CA
Dr. Maher Abdallah
M.D.
Palm Springs, CA
Compare Specialist 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 Specialist 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
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Understanding Medicare Claims Data
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Frequently Asked Questions
What is Marian Fedak, M.D.'s specialty? ▼
Marian Fedak, M.D. specializes in Specialist and practices in Los Angeles, California. Credentials: M.D..
How much does Marian Fedak, M.D. prescribe under Medicare Part D? ▼
In 2023, Marian Fedak, M.D. wrote 492 Medicare Part D claims totaling $23K in drug costs for 15 beneficiaries.
Where is Marian Fedak, M.D. located? ▼
Marian Fedak, M.D. is located at 1700 E CESAR E CHAVEZ AVE, Los Angeles, CA, 90033. Phone: (323) 264-4114.
What is Marian Fedak, M.D.'s NPI number? ▼
Marian Fedak, M.D.'s National Provider Identifier (NPI) is 1245313683, issued on 10/21/2006.
Does Marian Fedak, M.D. prescribe more brand-name or generic drugs? ▼
Marian Fedak, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $16K in brand drug costs.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Marian Fedak, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Marian Fedak, M.D.'s most frequently prescribed drugs include Metformin Hcl, Eliquis, Incruse Ellipta. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marian Fedak, M.D. accept Medicare? ▼
Marian Fedak, M.D. appears in CMS Medicare data with 492 Part D claims and 15 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marian Fedak, M.D.'s credentials? ▼
Marian Fedak, M.D.'s NPI is 1245313683 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
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.