NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1326219429 M.D.
Verify on CMS → John Chong, M.D.
Ophthalmology Physician in Centreville, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 22,082 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
663
Medicare Part D claims · 188 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
76%
generic claims · 24% 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
John Chong, M.D. filed 663 Medicare Part D claims in 2023 as a Ophthalmology Physician in Centreville, Virginia, prescribing 76% generic.
- 663
- Part D claims, 2023
- 76%
- 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.
John Chong, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
663 Top 31% higher than 69% 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
◑
Board-eligible specialty (heuristic, not verified)
John Chong, M.D. 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 John Chong, M.D.?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
663 53% vs specialty avg
Specialty distribution in Virginia
How Ophthalmology Physician compares to other specialties among Virginia 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).
John Chong, M.D. appears in the CMS NPPES registry as an Ophthalmology Physician provider holding M.D. credentials at 5900 FORT DR, Centreville, VA, 20121, with a listed phone of (571) 210-5535. NPI 1326219429 was issued on 03/17/2008.
Medicare Part D records for calendar year 2023 show 663 prescription claims written by this provider, covering 188 Medicare beneficiaries and totaling roughly $49K in drug spend, split 24% brand-name and 76% generic by claim count.
Ophthalmology Physician is a mid-sized specialty nationwide, with 22,082 enrolled providers across 56 states and an average of 1,420 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 | 1326219429 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/17/2008 |
Brand vs generic prescribing mix · Typical
John Chong, M.D. - brand share 24.0%
Ophthalmology Physician average
24% brand-name claims vs 76% generic, on 663 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.
663
Total Claims
$49K
Total Drug Cost
188
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 978
- Total Day Supply
- 25,244
- Brand vs Generic
- 24% brand / 76% generic
- Brand Drug Cost
- $40K
- Generic Drug Cost
- $8K
Patient Demographics
- Average Patient Age
- 75.8 years
- Avg HCC Risk Score
- 1.08
- Gender Split
- 57% female / 43% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Chong, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
292 claims
- Erythromycin 113
Erythromycin
113 claims
- Timolol Maleate 63
Timolol Maleate
63 claims
- Alphagan P 50
Alphagan P
50 claims
- Dorzolamide Hcl 34
Dorzolamide Hcl
34 claims
- Lumigan 28
Lumigan
28 claims
- Dorzolamide-Timolol 11
Dorzolamide-Timolol
11 claims
| Drug | Claims |
|---|---|
| Latanoprost | 292 |
| Erythromycin Erythromycin Base | 113 |
| Timolol Maleate | 63 |
| Alphagan P Brimonidine Tartrate | 50 |
| Dorzolamide Hcl | 34 |
| Lumigan Bimatoprost | 28 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How John Chong, M.D. fits within the Ophthalmology Physician landscape nationally.
22,082
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider
John Chong, M.D.'s 663 claims are below the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Chong.
Dr. Benjamin Abramowitz
MD
Manassas, VA
Dr. Eric Adams
MD
Norfolk, VA
Dr. Rohit Adyanthaya
MD
Norfolk, VA
Dr. George Agritellis
M.D.
Winchester, VA
Dr. Sameer Ahmad
M.D.
Herndon, VA
Compare Ophthalmology 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 Virginia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Ophthalmology 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 John Chong, M.D.'s specialty? ▼
John Chong, M.D. specializes in Ophthalmology Physician and practices in Centreville, Virginia. Credentials: M.D..
How much does John Chong, M.D. prescribe under Medicare Part D? ▼
In 2023, John Chong, M.D. wrote 663 Medicare Part D claims totaling $49K in drug costs for 188 beneficiaries.
Where is John Chong, M.D. located? ▼
John Chong, M.D. is located at 5900 FORT DR, Centreville, VA, 20121. Phone: (571) 210-5535.
What is John Chong, M.D.'s NPI number? ▼
John Chong, M.D.'s National Provider Identifier (NPI) is 1326219429, issued on 03/17/2008.
Does John Chong, M.D. prescribe more brand-name or generic drugs? ▼
John Chong, M.D.'s prescribing is 24% brand-name and 76% generic drugs by claim count, with $40K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,082 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
What drugs does John Chong, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, John Chong, M.D.'s most frequently prescribed drugs include Latanoprost, Erythromycin, Timolol Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Chong, M.D. accept Medicare? ▼
John Chong, M.D. appears in CMS Medicare data with 663 Part D claims and 188 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Chong, M.D.'s credentials? ▼
John Chong, M.D.'s NPI is 1326219429 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
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.