NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1588748891 M.D.
Verify on CMS → Lothar McMillian, M.D.
Family Medicine Physician in Laguna Niguel, 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 147,760 in Family 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
8K
Medicare Part D claims · 534 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$28
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Lothar McMillian, M.D. filed 7,523 Medicare Part D claims in 2023 as a Family Medicine Physician in Laguna Niguel, California, prescribing 91% generic.
- 8K
- Part D claims, 2023
- 91%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥97th
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1588748891 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-MID · PHOTO-ENUM
- NPI-10 1588748891
- ENUM-LEGACY 2006
- TAX-MEGA 148K Family Medicine
- RX-MID 7,523
- BOOK-MID 15,933 in California
- PHOTO-ENUM Michael Flores · 2006
Lothar McMillian, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
7,523 ≥ 97th percentile 97% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Lothar McMillian, 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 Lothar McMillian, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
7,523 120% vs specialty avg
Specialty distribution in California
How Family Medicine 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 Family Medicine 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).
Practice Address
Provider Details
| NPI | 1588748891 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/24/2006 |
Hospital and facility affiliations
Facilities where Lothar McMillian, 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.
Centers For Family Medicine GP
San Clemente, CA
Healthcare Partners Affiliates Medical Group
San Juan Capistrano, 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 Lothar McMillian, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$28
Largest payer
Exact Sciences Corporation
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 Lothar McMillian, M.D.. To verify Lothar McMillian, 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
Lothar McMillian, M.D. - brand share 9.0%
Family Medicine Physician average
9% brand-name claims vs 91% generic, on 7,523 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.
7,523
Total Claims
$525K
Total Drug Cost
534
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 16,812
- Total Day Supply
- 486,372
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $370K
- Generic Drug Cost
- $153K
- Opioid Claims
- 246 (3.3% rate)
- Antibiotic Claims
- 263
Patient Demographics
- Average Patient Age
- 77.0 years
- Avg HCC Risk Score
- 1.90
- Gender Split
- 49% female / 51% male
- Age Distribution
- <65: 25, 65-74: 204, 75-84: 188, 85+: 117
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Lothar McMillian, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
517 claims
- Levothyroxine Sodium
Levothyroxine Sodium
426 claims
- Lisinopril
Lisinopril
293 claims
- Amlodipine Besylate
Amlodipine Besylate
229 claims
- Losartan Potassium
Losartan Potassium
218 claims
- Meloxicam 195
Meloxicam
195 claims
- Metoprolol Succinate 166
Metoprolol Succinate
166 claims
- Furosemide 158
Furosemide
158 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 517 |
| Levothyroxine Sodium | 426 |
| Lisinopril | 293 |
| Amlodipine Besylate | 229 |
| Losartan Potassium | 218 |
| Meloxicam | 195 |
| Metoprolol Succinate | 166 |
| Furosemide | 158 |
| Gabapentin | 157 |
| Simvastatin | 149 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Lothar McMillian, M.D. fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Lothar McMillian, M.D.'s 7,523 claims are above the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for McMillian, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as McMillian.
One of 15,933 Family Medicine Physician providers enrolled in California, 5 are shown here.
Dr. Omer Aba-Omer
MD
Santa Monica, CA
Dr. Michelle Ababa
MD
Wilmington, CA
Dr. Anna Tzeitel Abalos
MD
Roseville, CA
Dr. Adan Abarca
MD
Anaheim, CA
Dr. Lorraine Abate
M.D.
Sacramento, CA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Lothar McMillian, M.D.'s specialty? ▼
Lothar McMillian, M.D. specializes in Family Medicine Physician and practices in Laguna Niguel, California. Credentials: M.D..
How much does Lothar McMillian, M.D. prescribe under Medicare Part D? ▼
In 2023, Lothar McMillian, M.D. wrote 7,523 Medicare Part D claims totaling $525K in drug costs for 534 beneficiaries.
Where is Lothar McMillian, M.D. located? ▼
Lothar McMillian, M.D. is located at 30281 GOLDEN LANTERN, Laguna Niguel, CA, 92677. Phone: (949) 495-7144.
What is Lothar McMillian, M.D.'s NPI number? ▼
Lothar McMillian, M.D.'s National Provider Identifier (NPI) is 1588748891, issued on 10/24/2006.
Does Lothar McMillian, M.D. prescribe more brand-name or generic drugs? ▼
Lothar McMillian, M.D.'s prescribing is 9% brand-name and 91% generic drugs by claim count, with $370K in brand drug costs.
Does Lothar McMillian, M.D. prescribe opioids? ▼
Yes, Lothar McMillian, M.D. had 246 opioid claims in 2023 with an opioid prescribing rate of 3.3%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Lothar McMillian, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Lothar McMillian, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Lothar McMillian, M.D. accept Medicare? ▼
Lothar McMillian, M.D. appears in CMS Medicare data with 7,523 Part D claims and 534 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Lothar McMillian, M.D.'s credentials? ▼
Lothar McMillian, M.D.'s NPI is 1588748891 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.