NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1477971125 MD
Verify on CMS → Homayoun Siman, MD
General Practice Physician in Palm Desert, 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 16,725 in General Practice 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
12K
Medicare Part D claims · 969 beneficiaries · General Practice Physician avg: 3K
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
85.7/100
▲ 3 pts above national avg 83.1 · Above neutral
Industry payments
$418.78
18 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
Homayoun Siman, MD reported a CMS MIPS final score of 85.7/100 - above the 83.1 national average - and filed 11,616 Medicare Part D claims in 2023.
- 85.7/100
- MIPS score · +3 vs avg
- 12K
- Part D claims, 2023
- 87%
- 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.
Homayoun Siman, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
86 49th percentile higher than 49% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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 Homayoun Siman, MD sits
This provider among general practice physician peers
Across the 783 general practice physician providers who report both Medicare Part D prescribing and a MIPS quality score, Homayoun Siman, MD writes more Part D claims than 91% of them and scores higher on MIPS quality than 58% - placing this provider in the high-volume, high-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 general practice physician peer from a representative sample of 60; the gold marker is Homayoun Siman, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Homayoun Siman, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 3 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 Homayoun Siman, MD?
High performer (top quartile)Primary specialty
General Practice Physician
Medicare Part D claims
11,616 304% vs specialty avg
MIPS final score
85.7/100 2.6 pts vs avg
Specialty distribution in California
How General Practice Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Homayoun Siman, MD's 2023 MIPS final score plotted against the General Practice Physician national average
- MIPS Final Score
- 85.7/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (General Practice Physician) - 85.7/100 vs national avg 83.1
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).
Homayoun Siman, MD appears in the CMS NPPES registry as a General Practice Physician provider holding MD credentials at 73211 FRED WARING DR STE 101, Palm Desert, CA, 92260, with a listed phone of (607) 837-0321. NPI 1477971125 was issued on 03/31/2014.
Medicare Part D records for calendar year 2023 show 11,616 prescription claims written by this provider, covering 969 Medicare beneficiaries and totaling roughly $1.7 million in drug spend, split 13% brand-name and 87% generic by claim count, with an opioid prescribing rate of 2.8%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 85.7/100 for the 2023 performance year (Quality 69.4, Cost 93.1), compared with the national average of 83.1.
General Practice Physician is a mid-sized specialty nationwide, with 16,725 enrolled providers across 56 states and an average of 2,872 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 | 1477971125 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 03/31/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
85.693
Final Score
Avg: 83.1
69.3863
Quality
93.1282
Cost
Reporting: Individual
Hospital and facility affiliations
Facilities where Homayoun Siman, MD 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.
According to CMS billing records, Homayoun Siman, MD is affiliated with 3 Medicare-billing facilities.
Complete Care Family Medical Clinic
Wilmington, CA
Healing Hand Family Care Clinics Corp
Indio, CA
Homayoun Siman Apc
Palm Desert, 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 Homayoun Siman, MD. Source: openpaymentsdata.cms.gov.
Total received
$419
Largest payer
SHIELD THERAPEUTICS 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 Homayoun Siman, MD. To verify Homayoun Siman, 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 · Typical
Homayoun Siman, MD - brand share 13.0%
General Practice Physician average
13% brand-name claims vs 87% generic, on 11,616 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.
11,616
Total Claims
$1.7M
Total Drug Cost
969
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 27,647
- Total Day Supply
- 811,222
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $1.4M
- Generic Drug Cost
- $302K
- Opioid Claims
- 331 (2.8% rate)
- Antibiotic Claims
- 241
Patient Demographics
- Average Patient Age
- 75.1 years
- Avg HCC Risk Score
- 1.73
- Gender Split
- 53% female / 47% male
- Age Distribution
- <65: 48, 65-74: 427, 75-84: 357, 85+: 137
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Homayoun Siman, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
772 claims
- Levothyroxine Sodium
Levothyroxine Sodium
507 claims
- Losartan Potassium
Losartan Potassium
349 claims
- Amlodipine Besylate
Amlodipine Besylate
347 claims
- Montelukast Sodium
Montelukast Sodium
312 claims
- Rosuvastatin Calcium 268
Rosuvastatin Calcium
268 claims
- Tamsulosin Hcl 225
Tamsulosin Hcl
225 claims
- Losartan-Hydrochlo… 222
Losartan-Hydrochlorothiazide
222 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 772 |
| Levothyroxine Sodium | 507 |
| Losartan Potassium | 349 |
| Amlodipine Besylate | 347 |
| Montelukast Sodium | 312 |
| Rosuvastatin Calcium | 268 |
| Tamsulosin Hcl | 225 |
| Losartan-Hydrochlorothiazide Losartan/Hydrochlorothiazide | 222 |
| Gabapentin | 221 |
| Omeprazole | 202 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Physician Overview
How Homayoun Siman, MD fits within the General Practice Physician landscape nationally.
16,725
General Practice Physician Providers in US
56
States with General Practice Physician
2,872
Avg Claims per Provider
Homayoun Siman, MD's 11,616 claims are above the specialty average of 2,872.
Nearby General Practice Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Siman.
Dr. Dalal Aago
MD
El Cajon, CA
Dr. Hessam Aazami
M.D.
Canoga Park, CA
Dr. Kenric Aban
M.D.
Oceanside, CA
Dr. Tahira Abbasi
MD
La Jolla, CA
Dr. Ryan Abbott
M.D.
Los Angeles, CA
Compare General Practice Physician 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 General Practice 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 Homayoun Siman, MD's specialty? ▼
Homayoun Siman, MD specializes in General Practice Physician and practices in Palm Desert, California. Credentials: MD.
How much does Homayoun Siman, MD prescribe under Medicare Part D? ▼
In 2023, Homayoun Siman, MD wrote 11,616 Medicare Part D claims totaling $1.7M in drug costs for 969 beneficiaries.
What is Homayoun Siman, MD's Medicare quality score? ▼
Homayoun Siman, MD has a CMS MIPS Final Score of 85.7/100 (Quality: 69.4, Cost: 93.1). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Homayoun Siman, MD located? ▼
Homayoun Siman, MD is located at 73211 FRED WARING DR STE 101, Palm Desert, CA, 92260. Phone: (607) 837-0321.
What is Homayoun Siman, MD's NPI number? ▼
Homayoun Siman, MD's National Provider Identifier (NPI) is 1477971125, issued on 03/31/2014.
Does Homayoun Siman, MD prescribe more brand-name or generic drugs? ▼
Homayoun Siman, MD's prescribing is 13% brand-name and 87% generic drugs by claim count, with $1.4M in brand drug costs.
Does Homayoun Siman, MD prescribe opioids? ▼
Yes, Homayoun Siman, MD had 331 opioid claims in 2023 with an opioid prescribing rate of 2.8%.
How many General Practice Physician providers are there in the US? ▼
There are 16,725 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,872 Medicare Part D claims per year.
What drugs does Homayoun Siman, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Homayoun Siman, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Homayoun Siman, MD accept Medicare? ▼
Homayoun Siman, MD appears in CMS Medicare data with 11,616 Part D claims and 969 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Homayoun Siman, MD's credentials? ▼
Homayoun Siman, MD's NPI is 1477971125 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
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.