NPI registry status
Active
2026 NPPES data Pain Medicine (Physical Medicine & Rehabilitation) Physician NPI 1225477557 M.D.
Verify on CMS → Alexander Feng, M.D.
Pain Medicine (Physical Medicine & Rehabilitation) Physician in Monterey Park, 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
2K
Medicare Part D claims · 576 beneficiaries · Pain Medicine (Physical Medicine & Rehabilitation) Physician avg: 1K
Generic prescribing
94%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$122.65
7 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
Alexander Feng, M.D. filed 1,831 Medicare Part D claims in 2023 as a Pain Medicine (Physical Medicine & Rehabilitation) Physician in Monterey Park, California, prescribing 94% generic.
- 2K
- Part D claims, 2023
- 94%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Alexander Feng, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,831 Top 17% higher than 83% 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 certification likely (heuristic, not verified)
Alexander Feng, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Alexander Feng, M.D.?
Quality data not reportedPrimary specialty
Pain Medicine (Physical Medicine & Rehabilitation) Physician
Medicare Part D claims
1,831 31% 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).
Alexander Feng, M.D. appears in the CMS NPPES registry as a Pain Medicine (Physical Medicine & Rehabilitation) Physician provider holding M.D. credentials at 455 N GARFIELD AVE FL 2, Monterey Park, CA, 91754, with a listed phone of (833) 476-7377. NPI 1225477557 was issued on 06/20/2013.
Medicare Part D records for calendar year 2023 show 1,831 prescription claims written by this provider, covering 576 Medicare beneficiaries and totaling roughly $94K in drug spend, split 6% brand-name and 94% generic by claim count, with an opioid prescribing rate of 18.7%.
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 | 1225477557 |
|---|---|
| Specialty | Pain Medicine (Physical Medicine & Rehabilitation) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/20/2013 |
Hospital and facility affiliations
Facilities where Alexander Feng, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Integrative Physical Medicine Physicians
Irvine, CA
Integrative Sports And Spine Inc
City Of Industry, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Alexander Feng, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$123
Largest payer
Forte Bio-Pharma 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 Alexander Feng, M.D.. To verify Alexander Feng, 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
Alexander Feng, M.D. - brand share 6.0%
Pain Medicine (Physical Medicine & Rehabilitation) Physician average
6% brand-name claims vs 94% generic, on 1,831 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.
1,831
Total Claims
$94K
Total Drug Cost
576
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,946
- Total Day Supply
- 54,325
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $39K
- Generic Drug Cost
- $55K
- Opioid Claims
- 343 (18.7% rate)
Patient Demographics
- Average Patient Age
- 72.7 years
- Avg HCC Risk Score
- 1.42
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 42, 65-74: 321, 75-84: 164, 85+: 49
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Alexander Feng, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Gabapentin
Gabapentin
428 claims
- Baclofen
Baclofen
258 claims
- Diclofenac Sodium
Diclofenac Sodium
187 claims
- Pregabalin
Pregabalin
180 claims
- Hydrocodone-Acetam… 139
Hydrocodone-Acetaminophen
139 claims
- Celecoxib 108
Celecoxib
108 claims
- Acetaminophen-Code… 60
Acetaminophen-Codeine
60 claims
- Lidocaine 59
Lidocaine
59 claims
| Drug | Claims |
|---|---|
| Gabapentin | 428 |
| Baclofen | 258 |
| Diclofenac Sodium | 187 |
| Pregabalin | 180 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 139 |
| Celecoxib | 108 |
| Acetaminophen-Codeine Acetaminophen With Codeine | 60 |
| Lidocaine | 59 |
| Tramadol Hcl | 50 |
| Ztlido Lidocaine | 48 |
* 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 Alexander Feng, 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
Alexander Feng, M.D.'s 1,831 claims are above 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 Feng.
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.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore California
Frequently Asked Questions
What is Alexander Feng, M.D.'s specialty? ▼
Alexander Feng, M.D. specializes in Pain Medicine (Physical Medicine & Rehabilitation) Physician and practices in Monterey Park, California. Credentials: M.D..
How much does Alexander Feng, M.D. prescribe under Medicare Part D? ▼
In 2023, Alexander Feng, M.D. wrote 1,831 Medicare Part D claims totaling $94K in drug costs for 576 beneficiaries.
Where is Alexander Feng, M.D. located? ▼
Alexander Feng, M.D. is located at 455 N GARFIELD AVE FL 2, Monterey Park, CA, 91754. Phone: (833) 476-7377.
What is Alexander Feng, M.D.'s NPI number? ▼
Alexander Feng, M.D.'s National Provider Identifier (NPI) is 1225477557, issued on 06/20/2013.
Does Alexander Feng, M.D. prescribe more brand-name or generic drugs? ▼
Alexander Feng, M.D.'s prescribing is 6% brand-name and 94% generic drugs by claim count, with $39K in brand drug costs.
Does Alexander Feng, M.D. prescribe opioids? ▼
Yes, Alexander Feng, M.D. had 343 opioid claims in 2023 with an opioid prescribing rate of 18.7%.
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 Alexander Feng, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Alexander Feng, M.D.'s most frequently prescribed drugs include Gabapentin, Baclofen, Diclofenac Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alexander Feng, M.D. accept Medicare? ▼
Alexander Feng, M.D. appears in CMS Medicare data with 1,831 Part D claims and 576 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alexander Feng, M.D.'s credentials? ▼
Alexander Feng, M.D.'s NPI is 1225477557 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.