NPI registry status
Active
2026 NPPES data Ambulatory Care Pharmacist NPI 1821621731
Verify on CMS → Lucas Chang
Ambulatory Care Pharmacist in Union City, 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 3,496 in Ambulatory Care Pharmacist, 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
943
Medicare Part D claims · 184 beneficiaries · Ambulatory Care Pharmacist avg: 492
Generic prescribing
65%
generic claims · 28% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Lucas Chang filed 943 Medicare Part D claims in 2023 as a Ambulatory Care Pharmacist in Union City, California, prescribing 65% generic.
- 943
- Part D claims, 2023
- 65%
- 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.
Lucas Chang's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
943 Top 25% higher than 75% 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 Lucas Chang?
Quality data not reportedPrimary specialty
Ambulatory Care Pharmacist
Medicare Part D claims
943 92% vs specialty avg
Specialty distribution in California
How Ambulatory Care Pharmacist 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 Ambulatory Care Pharmacist. 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).
Lucas Chang appears in the CMS NPPES registry as a Ambulatory Care Pharmacist provider at 30116 EIGENBRODT WAY, Union City, CA, 94587, with a listed phone of (510) 566-3220. NPI 1821621731 was issued on 02/19/2020.
Medicare Part D records for calendar year 2023 show 943 prescription claims written by this provider, covering 184 Medicare beneficiaries and totaling roughly $190K in drug spend, split 28% brand-name and 65% generic by claim count.
Ambulatory Care Pharmacist is a narrow specialty nationwide, with 3,496 enrolled providers across 52 states and an average of 492 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 | 1821621731 |
|---|---|
| Specialty | Ambulatory Care Pharmacist |
| Gender | Male |
| NPI Issued | 02/19/2020 |
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 Lucas Chang. To verify Lucas Chang'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 · Above average
Lucas Chang - brand share 28.0%
Ambulatory Care Pharmacist average
28% brand-name claims vs 65% generic, on 943 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.
943
Total Claims
$190K
Total Drug Cost
184
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,872
- Total Day Supply
- 85,983
- Brand vs Generic
- 28% brand / 65% generic
- Brand Drug Cost
- $178K
- Generic Drug Cost
- $10K
Patient Demographics
- Average Patient Age
- 69.9 years
- Avg HCC Risk Score
- 1.14
- Gender Split
- 47% female / 53% male
- Age Distribution
- <65: 12, 65-74: 143, 75-84: 29, 85+: 0
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Lucas Chang prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
115 claims
- Metformin Hcl Er
Metformin Hcl Er
109 claims
- Glipizide Er
Glipizide Er
91 claims
- Glipizide
Glipizide
72 claims
- Metformin Hcl
Metformin Hcl
65 claims
- Ozempic
Ozempic
53 claims
- Jardiance
Jardiance
48 claims
- Humulin N 41
Humulin N
41 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 115 |
| Metformin Hcl Er Metformin Hcl | 109 |
| Glipizide Er Glipizide | 91 |
| Glipizide | 72 |
| Metformin Hcl | 65 |
| Ozempic Semaglutide | 53 |
| Jardiance Empagliflozin | 48 |
| Humulin N Insulin Nph Human Isophane | 41 |
| Lisinopril | 33 |
| Losartan Potassium | 29 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ambulatory Care Pharmacist Overview
How Lucas Chang fits within the Ambulatory Care Pharmacist landscape nationally.
3,496
Ambulatory Care Pharmacist Providers in US
52
States with Ambulatory Care Pharmacist
492
Avg Claims per Provider
Lucas Chang's 943 claims are above the specialty average of 492.
Nearby Ambulatory Care Pharmacist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chang.
Clare Adams
Mission Viejo, CA
Kristine Adzhemyan
Los Angeles, CA
Dr. Omar Ahmed
PHARMD
San Rafael, CA
Dr. Soo Ahn
PHARM.D.
Simi Valley, CA
Dr. Genevieve Aichelman
PHARM.D.
Lemoore, CA
Compare Ambulatory Care Pharmacist 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 Ambulatory Care Pharmacist 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 Lucas Chang's specialty? ▼
Lucas Chang specializes in Ambulatory Care Pharmacist and practices in Union City, California.
How much does Lucas Chang prescribe under Medicare Part D? ▼
In 2023, Lucas Chang wrote 943 Medicare Part D claims totaling $190K in drug costs for 184 beneficiaries.
Where is Lucas Chang located? ▼
Lucas Chang is located at 30116 EIGENBRODT WAY, Union City, CA, 94587. Phone: (510) 566-3220.
What is Lucas Chang's NPI number? ▼
Lucas Chang's National Provider Identifier (NPI) is 1821621731, issued on 02/19/2020.
Does Lucas Chang prescribe more brand-name or generic drugs? ▼
Lucas Chang's prescribing is 28% brand-name and 65% generic drugs by claim count, with $178K in brand drug costs.
How many Ambulatory Care Pharmacist providers are there in the US? ▼
There are 3,496 Ambulatory Care Pharmacist providers across 52 states in the US. The average Ambulatory Care Pharmacist provider writes 492 Medicare Part D claims per year.
What drugs does Lucas Chang prescribe most often? ▼
Based on 2023 Medicare Part D data, Lucas Chang's most frequently prescribed drugs include Atorvastatin Calcium, Metformin Hcl Er, Glipizide Er. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Lucas Chang accept Medicare? ▼
Lucas Chang appears in CMS Medicare data with 943 Part D claims and 184 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Lucas Chang's credentials? ▼
Lucas Chang's NPI is 1821621731. 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.