NPI registry status
Active
2026 NPPES data Emergency Medical Services (Emergency Medicine) Physician NPI 1528121845 MD
Verify on CMS → Anson Lam, MD
Emergency Medical Services (Emergency Medicine) Physician in Fullerton, 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 3,618 in Emergency Medical Services (Emergency 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
846
Medicare Part D claims · 462 beneficiaries · Emergency Medical Services (Emergency Medicine) Physician avg: 394
Generic prescribing
93%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
85/100
▲ 1 pts above national avg 83.5 · Above neutral
Industry payments
$15.07
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Anson Lam, MD reported a CMS MIPS final score of 85/100 - above the 83.5 national average - and filed 846 Medicare Part D claims in 2023.
- 85/100
- MIPS score · +1 vs avg
- 846
- Part D claims, 2023
- 93%
- 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.
Anson Lam, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
85 42nd percentile higher than 42% of 454,083 measured providers
Each bar is a band; taller bars hold more measured providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Anson Lam, MD sits
This provider among emergency medical services (emergency medicine) physician peers
Across the 571 emergency medical services (emergency medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Anson Lam, MD writes more Part D claims than 94% of them and scores higher on MIPS quality than 35% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one emergency medical services (emergency medicine) physician peer from a representative sample of 60; the gold marker is Anson Lam, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Anson Lam, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Anson Lam, MD?
Near national averagePrimary specialty
Emergency Medical Services (Emergency Medicine) Physician
Medicare Part D claims
846 115% vs specialty avg
MIPS final score
85/100 1.5 pts vs avg
Specialty distribution in California
How Emergency Medical Services (Emergency Medicine) Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Anson Lam, MD's 2023 MIPS final score plotted against the Emergency Medical Services (Emergency Medicine) Physician national average
- MIPS Final Score
- 85/100
- vs 83.5 national avg · 2023 performance year
MIPS final score (Emergency Medical Services (Emergency Medicine) Physician) - 85/100 vs national avg 83.5
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).
Anson Lam, MD appears in the CMS NPPES registry as an Emergency Medical Services (Emergency Medicine) Physician provider holding MD credentials at 101 E VALENCIA MESA DR, Fullerton, CA, 92835, with a listed phone of (714) 992-3965. NPI 1528121845 was issued on 12/18/2006.
Medicare Part D records for calendar year 2023 show 846 prescription claims written by this provider, covering 462 Medicare beneficiaries and totaling roughly $22K in drug spend, split 6% brand-name and 93% generic by claim count, with an opioid prescribing rate of 9.2%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 85/100 for the 2023 performance year (Quality 70.5), compared with the 83.5 average among clinicians with a measured score.
Emergency Medical Services (Emergency Medicine) Physician is a narrow specialty nationwide, with 3,618 enrolled providers across 55 states and an average of 394 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 | 1528121845 |
|---|---|
| Specialty | Emergency Medical Services (Emergency Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 12/18/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
84.9574
Final Score
Measured-score avg: 83.5
70.5382
Quality
Reporting: Group practice
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 Anson Lam, MD. Source: openpaymentsdata.cms.gov.
Total received
$15
Largest payer
PFIZER 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 Anson Lam, MD. To verify Anson Lam, MD'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
Anson Lam, MD - brand share 6.0%
Emergency Medical Services (Emergency Medicine) Physician average
6% brand-name claims vs 93% generic, on 846 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.
846
Total Claims
$22K
Total Drug Cost
462
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 876
- Total Day Supply
- 10,760
- Brand vs Generic
- 6% brand / 93% generic
- Brand Drug Cost
- $8K
- Generic Drug Cost
- $14K
- Opioid Claims
- 78 (9.2% rate)
- Antibiotic Claims
- 204
Patient Demographics
- Average Patient Age
- 77.6 years
- Avg HCC Risk Score
- 1.80
- Gender Split
- 62% female / 38% male
- Age Distribution
- <65: 21, 65-74: 157, 75-84: 170, 85+: 114
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Anson Lam, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ondansetron Odt
Ondansetron Odt
133 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
54 claims
- Cefpodoxime Proxetil 50
Cefpodoxime Proxetil
50 claims
- Ibuprofen 50
Ibuprofen
50 claims
- Methylprednisolone 50
Methylprednisolone
50 claims
- Amoxicillin-Clavul… 38
Amoxicillin-Clavulanate Potass
38 claims
- Azithromycin 26
Azithromycin
26 claims
- Furosemide 25
Furosemide
25 claims
| Drug | Claims |
|---|---|
| Ondansetron Odt Ondansetron | 133 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 54 |
| Cefpodoxime Proxetil | 50 |
| Ibuprofen | 50 |
| Methylprednisolone | 50 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 38 |
| Azithromycin | 26 |
| Furosemide | 25 |
| Potassium Chloride | 25 |
| Cyclobenzaprine Hcl | 21 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Emergency Medical Services (Emergency Medicine) Physician in CA →
All providers in California →
Compare specialties →
Emergency Medical Services (Emergency Medicine) Physician Overview
How Anson Lam, MD fits within the Emergency Medical Services (Emergency Medicine) Physician landscape nationally.
3,618
Emergency Medical Services (Emergency Medicine) Physician Providers in US
55
States with Emergency Medical Services (Emergency Medicine) Physician
394
Avg Claims per Provider
Anson Lam, MD's 846 claims are above the specialty average of 394.
Nearby Emergency Medical Services (Emergency Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Lam.
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 Emergency Medical Services (Emergency 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 Anson Lam, MD's specialty? ▼
Anson Lam, MD specializes in Emergency Medical Services (Emergency Medicine) Physician and practices in Fullerton, California. Credentials: MD.
How much does Anson Lam, MD prescribe under Medicare Part D? ▼
In 2023, Anson Lam, MD wrote 846 Medicare Part D claims totaling $22K in drug costs for 462 beneficiaries.
What is Anson Lam, MD's Medicare quality score? ▼
Anson Lam, MD has a CMS MIPS Final Score of 85/100 (Quality: 70.5). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Anson Lam, MD located? ▼
Anson Lam, MD is located at 101 E VALENCIA MESA DR, Fullerton, CA, 92835. Phone: (714) 992-3965.
What is Anson Lam, MD's NPI number? ▼
Anson Lam, MD's National Provider Identifier (NPI) is 1528121845, issued on 12/18/2006.
Does Anson Lam, MD prescribe more brand-name or generic drugs? ▼
Anson Lam, MD's prescribing is 6% brand-name and 93% generic drugs by claim count, with $8K in brand drug costs.
Does Anson Lam, MD prescribe opioids? ▼
Yes, Anson Lam, MD had 78 opioid claims in 2023 with an opioid prescribing rate of 9.2%.
How many Emergency Medical Services (Emergency Medicine) Physician providers are there in the US? ▼
There are 3,618 Emergency Medical Services (Emergency Medicine) Physician providers across 55 states in the US. The average Emergency Medical Services (Emergency Medicine) Physician provider writes 394 Medicare Part D claims per year.
What drugs does Anson Lam, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Anson Lam, MD's most frequently prescribed drugs include Ondansetron Odt, Hydrocodone-Acetaminophen, Cefpodoxime Proxetil. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Anson Lam, MD accept Medicare? ▼
Anson Lam, MD appears in CMS Medicare data with 846 Part D claims and 462 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Anson Lam, MD's credentials? ▼
Anson Lam, MD's NPI is 1528121845 with credentials MD. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.