NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1902997240 MD
Verify on CMS → Cesar Sierra, MD
Ophthalmology Physician in Westport, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 22,388 in Ophthalmology 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
310
Medicare Part D claims · 145 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
85%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Cesar Sierra, MD filed 310 Medicare Part D claims in 2024 as an Ophthalmology Physician in Westport, Connecticut, prescribing 85% generic.
- 310
- Part D claims, 2024
- 85%
- generic prescribing
- ≥56th
- 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.
Federal trust snapshot
What official records show about Cesar Sierra, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1902997240), first enumerated 09/28/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 310 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1902997240 · Ophthalmology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1902997240
- ENUM-LEGACY 2006
- TAX-MID 22K Ophthalmology Physician
- RX-LIGHT 310
- BOOK-THIN 347 in Connecticut
- PHOTO-ENUM Timothy Scott, MD · 2006
Cesar Sierra, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
310 ≥ 56th percentile 56% of 1,416,883 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 · 2024
◑
Board-eligible specialty (heuristic, not verified)
Cesar Sierra, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Cesar Sierra, MD?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
310 79% vs specialty avg
Specialty distribution in Connecticut
How Ophthalmology Physician compares to other specialties among Connecticut 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 Ophthalmology 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 | 1902997240 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/28/2006 |
Brand vs generic prescribing mix · Typical
Cesar Sierra, MD - brand share 15.0%
Ophthalmology Physician average
15% brand-name claims vs 85% generic, on 310 2024 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 2024.
310
Total Claims
$30K
Total Drug Cost
145
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 331
- Total Day Supply
- 4,635
- Brand vs Generic
- 15% brand / 85% generic
- Brand Drug Cost
- $24K
- Generic Drug Cost
- $7K
- Antibiotic Claims
- 86
Patient Demographics
- Average Patient Age
- 76.7 years
- Avg HCC Risk Score
- 1.05
- Gender Split
- 60% female / 40% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Cesar Sierra, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Erythromycin
Erythromycin
133 claims
- Cephalexin
Cephalexin
56 claims
- Restasis 19
Restasis
19 claims
- Neomycin-Polymyxin… 18
Neomycin-Polymyxin-Dexameth
18 claims
- Azithromycin 17
Azithromycin
17 claims
- Tobramycin-Dexamet… 16
Tobramycin-Dexamethasone
16 claims
- Methylprednisolone 12
Methylprednisolone
12 claims
| Drug | Claims |
|---|---|
| Erythromycin Erythromycin Base | 133 |
| Cephalexin | 56 |
| Restasis Cyclosporine | 19 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 18 |
| Azithromycin | 17 |
| Tobramycin-Dexamethasone Tobramycin/Dexamethasone | 16 |
| Methylprednisolone | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Cesar Sierra, MD fits within the Ophthalmology Physician landscape nationally.
22,388
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,490
Avg Claims per Provider
Cesar Sierra, MD's 310 claims are below the specialty average of 1,490.
Nationwide Ophthalmology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Sierra, both outside Connecticut 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 Ophthalmology Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Sierra.
One of 347 Ophthalmology Physician providers enrolled in Connecticut, 5 are shown here.
Dr. Marcio Abreu
M.D.
Bridgeport, CT
Dr. Bruce Altman
M.D.
Danbury, CT
Dr. Laura Andrews
MD
Waterbury, CT
Shimy Apoorva
Waterbury, CT
Dr. Yehuda Assouline
M.D.
Danbury, CT
Compare Ophthalmology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Cesar Sierra, MD's specialty? ▼
Cesar Sierra, MD specializes in Ophthalmology Physician and practices in Westport, Connecticut. Credentials: MD.
How much does Cesar Sierra, MD prescribe under Medicare Part D? ▼
In 2024, Cesar Sierra, MD wrote 310 Medicare Part D claims totaling $30K in drug costs for 145 beneficiaries.
Where is Cesar Sierra, MD located? ▼
Cesar Sierra, MD is located at 162 KINGS HWY N, Westport, CT, 06880. Phone: (203) 226-1696.
What is Cesar Sierra, MD's NPI number? ▼
Cesar Sierra, MD's National Provider Identifier (NPI) is 1902997240, issued on 09/28/2006.
Does Cesar Sierra, MD prescribe more brand-name or generic drugs? ▼
Cesar Sierra, MD's prescribing is 15% brand-name and 85% generic drugs by claim count, with $24K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,388 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,490 Medicare Part D claims per year.
What drugs does Cesar Sierra, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Cesar Sierra, MD's most frequently prescribed drugs include Erythromycin, Cephalexin, Restasis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cesar Sierra, MD accept Medicare? ▼
Cesar Sierra, MD appears in CMS Medicare data with 310 Part D claims and 145 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cesar Sierra, MD's credentials? ▼
Cesar Sierra, MD's NPI is 1902997240 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.