NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1215927629 MD
Verify on CMS → Diemngoc Dang, MD
Ophthalmology Physician in Fredericksburg, 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
728
Medicare Part D claims · 170 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
63%
generic claims · 37% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$201.5
4 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
Diemngoc Dang, MD filed 728 Medicare Part D claims in 2023 as a Ophthalmology Physician in Fredericksburg, Virginia, prescribing 63% generic.
- 728
- Part D claims, 2023
- 63%
- generic prescribing
- $201.5
- industry payments (Sunshine Act)
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.
Diemngoc Dang, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
728 Top 29% higher than 71% 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)
Diemngoc Dang, 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 Diemngoc Dang, MD?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
728 49% 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).
Diemngoc Dang, MD appears in the CMS NPPES registry as an Ophthalmology Physician provider holding MD credentials at 4710 SPOTSYLVANIA PKWY, Fredericksburg, VA, 22407, with a listed phone of (540) 741-2733. NPI 1215927629 was issued on 10/26/2005.
Medicare Part D records for calendar year 2023 show 728 prescription claims written by this provider, covering 170 Medicare beneficiaries and totaling roughly $117K in drug spend, split 37% brand-name and 63% 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 | 1215927629 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 10/26/2005 |
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 Diemngoc Dang, MD. Source: openpaymentsdata.cms.gov.
Total received
$202
Largest payer
Bausch & Lomb Americas 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.
Brand vs generic prescribing mix · Above average
Diemngoc Dang, MD - brand share 37.0%
Ophthalmology Physician average
37% brand-name claims vs 63% generic, on 728 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.
728
Total Claims
$117K
Total Drug Cost
170
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,285
- Total Day Supply
- 35,856
- Brand vs Generic
- 37% brand / 63% generic
- Brand Drug Cost
- $97K
- Generic Drug Cost
- $20K
Patient Demographics
- Average Patient Age
- 74.5 years
- Avg HCC Risk Score
- 1.28
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 14, 65-74: 76, 75-84: 56, 85+: 24
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Diemngoc Dang, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
127 claims
- Prednisolone Acetate
Prednisolone Acetate
101 claims
- Ketorolac Trometha…
Ketorolac Tromethamine
71 claims
- Ofloxacin
Ofloxacin
65 claims
- Timolol Maleate 49
Timolol Maleate
49 claims
- Lumigan 48
Lumigan
48 claims
- Brimonidine Tartrate 41
Brimonidine Tartrate
41 claims
- Dorzolamide Hcl 28
Dorzolamide Hcl
28 claims
| Drug | Claims |
|---|---|
| Latanoprost | 127 |
| Prednisolone Acetate | 101 |
| Ketorolac Tromethamine | 71 |
| Ofloxacin | 65 |
| Timolol Maleate | 49 |
| Lumigan Bimatoprost | 48 |
| Brimonidine Tartrate | 41 |
| Dorzolamide Hcl | 28 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 28 |
| Restasis Cyclosporine | 25 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Diemngoc Dang, MD 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
Diemngoc Dang, MD's 728 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 Dang.
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 Diemngoc Dang, MD's specialty? ▼
Diemngoc Dang, MD specializes in Ophthalmology Physician and practices in Fredericksburg, Virginia. Credentials: MD.
How much does Diemngoc Dang, MD prescribe under Medicare Part D? ▼
In 2023, Diemngoc Dang, MD wrote 728 Medicare Part D claims totaling $117K in drug costs for 170 beneficiaries.
Where is Diemngoc Dang, MD located? ▼
Diemngoc Dang, MD is located at 4710 SPOTSYLVANIA PKWY, Fredericksburg, VA, 22407. Phone: (540) 741-2733.
What is Diemngoc Dang, MD's NPI number? ▼
Diemngoc Dang, MD's National Provider Identifier (NPI) is 1215927629, issued on 10/26/2005.
Does Diemngoc Dang, MD prescribe more brand-name or generic drugs? ▼
Diemngoc Dang, MD's prescribing is 37% brand-name and 63% generic drugs by claim count, with $97K 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 Diemngoc Dang, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Diemngoc Dang, MD's most frequently prescribed drugs include Latanoprost, Prednisolone Acetate, Ketorolac Tromethamine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Diemngoc Dang, MD accept Medicare? ▼
Diemngoc Dang, MD appears in CMS Medicare data with 728 Part D claims and 170 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Diemngoc Dang, MD's credentials? ▼
Diemngoc Dang, MD's NPI is 1215927629 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.
- 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.