NPI registry status
Active
2026 NPPES data Pain Medicine (Physical Medicine & Rehabilitation) Physician NPI 1184640583 M.D.
Verify on CMS → Marcia Elfenbaum, M.D.
Pain Medicine (Physical Medicine & Rehabilitation) Physician in San Diego, 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 1,630 in Pain Medicine (Physical Medicine & Rehabilitation) 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
1K
Medicare Part D claims · 62 beneficiaries · Pain Medicine (Physical Medicine & Rehabilitation) Physician avg: 1K
Generic prescribing
78%
generic claims · 23% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$40.76
2 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
Marcia Elfenbaum, M.D. filed 1,160 Medicare Part D claims in 2023 as a Pain Medicine (Physical Medicine & Rehabilitation) Physician in San Diego, California, prescribing 78% generic.
- 1K
- Part D claims, 2023
- 78%
- generic prescribing
- $40.76
- 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.
Marcia Elfenbaum, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,160 Top 23% higher than 77% 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
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Board-eligible specialty (heuristic, not verified)
Marcia Elfenbaum, 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 Marcia Elfenbaum, M.D.?
Quality data not reportedPrimary specialty
Pain Medicine (Physical Medicine & Rehabilitation) Physician
Medicare Part D claims
1,160 17% vs specialty avg
Specialty distribution in California
How Pain Medicine (Physical Medicine & Rehabilitation) 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 Pain Medicine (Physical Medicine & Rehabilitation) 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).
Marcia Elfenbaum, M.D. appears in the CMS NPPES registry as a Pain Medicine (Physical Medicine & Rehabilitation) Physician provider holding M.D. credentials at 9246 LIGHTWAVE AVE SUITE 120, San Diego, CA, 92123, with a listed phone of (800) 270-5016. NPI 1184640583 was issued on 07/15/2006.
Medicare Part D records for calendar year 2023 show 1,160 prescription claims written by this provider, covering 62 Medicare beneficiaries and totaling roughly $192K in drug spend, split 23% brand-name and 78% generic by claim count, with an opioid prescribing rate of 63.7%.
Pain Medicine (Physical Medicine & Rehabilitation) Physician is a narrow specialty nationwide, with 1,630 enrolled providers across 50 states and an average of 1,401 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 | 1184640583 |
|---|---|
| Specialty | Pain Medicine (Physical Medicine & Rehabilitation) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 07/15/2006 |
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 Marcia Elfenbaum, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$41
Largest payer
Lundbeck LLC
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 Marcia Elfenbaum, M.D.. To verify Marcia Elfenbaum, 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
Marcia Elfenbaum, M.D. - brand share 23.0%
Pain Medicine (Physical Medicine & Rehabilitation) Physician average
23% brand-name claims vs 78% generic, on 1,160 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.
1,160
Total Claims
$192K
Total Drug Cost
62
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,307
- Total Day Supply
- 36,733
- Brand vs Generic
- 23% brand / 78% generic
- Brand Drug Cost
- $150K
- Generic Drug Cost
- $42K
- Opioid Claims
- 739 (63.7% rate)
Patient Demographics
- Average Patient Age
- 68.6 years
- Avg HCC Risk Score
- 1.39
- Gender Split
- 69% female / 31% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Marcia Elfenbaum, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Oxycodone Hcl
Oxycodone Hcl
199 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
135 claims
- Gabapentin
Gabapentin
90 claims
- Morphine Sulfate Er 76
Morphine Sulfate Er
76 claims
- Pregabalin 67
Pregabalin
67 claims
- Morphine Sulfate 49
Morphine Sulfate
49 claims
- Oxycontin 49
Oxycontin
49 claims
- Belbuca 44
Belbuca
44 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 199 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 135 |
| Gabapentin | 90 |
| Morphine Sulfate Er Morphine Sulfate | 76 |
| Pregabalin | 67 |
| Morphine Sulfate | 49 |
| Oxycontin Oxycodone Hcl | 49 |
| Belbuca Buprenorphine Hcl | 44 |
| Tizanidine Hcl | 43 |
| Xtampza Er Oxycodone Myristate | 41 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Pain Medicine (Physical Medicine & Rehabilitation) Physician in CA →
All providers in California →
Compare specialties →
Pain Medicine (Physical Medicine & Rehabilitation) Physician Overview
How Marcia Elfenbaum, M.D. fits within the Pain Medicine (Physical Medicine & Rehabilitation) Physician landscape nationally.
1,630
Pain Medicine (Physical Medicine & Rehabilitation) Physician Providers in US
50
States with Pain Medicine (Physical Medicine & Rehabilitation) Physician
1,401
Avg Claims per Provider
Marcia Elfenbaum, M.D.'s 1,160 claims are below the specialty average of 1,401.
Nearby Pain Medicine (Physical Medicine & Rehabilitation) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Elfenbaum.
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 Pain Medicine (Physical Medicine & Rehabilitation) 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 Marcia Elfenbaum, M.D.'s specialty? ▼
Marcia Elfenbaum, M.D. specializes in Pain Medicine (Physical Medicine & Rehabilitation) Physician and practices in San Diego, California. Credentials: M.D..
How much does Marcia Elfenbaum, M.D. prescribe under Medicare Part D? ▼
In 2023, Marcia Elfenbaum, M.D. wrote 1,160 Medicare Part D claims totaling $192K in drug costs for 62 beneficiaries.
Where is Marcia Elfenbaum, M.D. located? ▼
Marcia Elfenbaum, M.D. is located at 9246 LIGHTWAVE AVE SUITE 120, San Diego, CA, 92123. Phone: (800) 270-5016.
What is Marcia Elfenbaum, M.D.'s NPI number? ▼
Marcia Elfenbaum, M.D.'s National Provider Identifier (NPI) is 1184640583, issued on 07/15/2006.
Does Marcia Elfenbaum, M.D. prescribe more brand-name or generic drugs? ▼
Marcia Elfenbaum, M.D.'s prescribing is 23% brand-name and 78% generic drugs by claim count, with $150K in brand drug costs.
Does Marcia Elfenbaum, M.D. prescribe opioids? ▼
Yes, Marcia Elfenbaum, M.D. had 739 opioid claims in 2023 with an opioid prescribing rate of 63.7%.
How many Pain Medicine (Physical Medicine & Rehabilitation) Physician providers are there in the US? ▼
There are 1,630 Pain Medicine (Physical Medicine & Rehabilitation) Physician providers across 50 states in the US. The average Pain Medicine (Physical Medicine & Rehabilitation) Physician provider writes 1,401 Medicare Part D claims per year.
What drugs does Marcia Elfenbaum, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Marcia Elfenbaum, M.D.'s most frequently prescribed drugs include Oxycodone Hcl, Hydrocodone-Acetaminophen, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marcia Elfenbaum, M.D. accept Medicare? ▼
Marcia Elfenbaum, M.D. appears in CMS Medicare data with 1,160 Part D claims and 62 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marcia Elfenbaum, M.D.'s credentials? ▼
Marcia Elfenbaum, M.D.'s NPI is 1184640583 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.