NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1508842634 MD
Verify on CMS → Delia Sang, MD
Retina Specialist (Ophthalmology) Physician in Brookline, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 913 in Retina Specialist (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
1K
Medicare Part D claims · 265 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 558
Generic prescribing
70%
generic claims · 30% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$67.19
3 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
Delia Sang, MD filed 1,183 Medicare Part D claims in 2023 as a Retina Specialist (Ophthalmology) Physician in Brookline, Massachusetts, prescribing 70% generic.
- 1K
- Part D claims, 2023
- 70%
- generic prescribing
- $67.19
- 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.
Delia Sang, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,183 Top 23% higher than 77% 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)
Delia Sang, 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 Delia Sang, MD?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
1,183 112% vs specialty avg
Specialty distribution in Massachusetts
How Retina Specialist (Ophthalmology) Physician compares to other specialties among Massachusetts 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 Retina Specialist (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).
Delia Sang, MD appears in the CMS NPPES registry as a Retina Specialist (Ophthalmology) Physician provider holding MD credentials at 1101 BEACON ST, Brookline, MA, 02446, with a listed phone of (617) 731-1760. NPI 1508842634 was issued on 12/20/2005.
Medicare Part D records for calendar year 2023 show 1,183 prescription claims written by this provider, covering 265 Medicare beneficiaries and totaling roughly $89K in drug spend, split 30% brand-name and 70% generic by claim count.
Retina Specialist (Ophthalmology) Physician is a narrow specialty nationwide, with 913 enrolled providers across 48 states and an average of 558 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 | 1508842634 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 12/20/2005 |
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 Delia Sang, MD. Source: openpaymentsdata.cms.gov.
Total received
$67
Largest payer
ABBVIE 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 - Massachusetts BORIM 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 ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Delia Sang, MD. To verify Delia Sang, MD's current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM 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 Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Delia Sang, MD - brand share 30.0%
Retina Specialist (Ophthalmology) Physician average
30% brand-name claims vs 70% generic, on 1,183 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.
1,183
Total Claims
$89K
Total Drug Cost
265
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,987
- Total Day Supply
- 57,085
- Brand vs Generic
- 30% brand / 70% generic
- Brand Drug Cost
- $67K
- Generic Drug Cost
- $23K
Patient Demographics
- Average Patient Age
- 81.3 years
- Avg HCC Risk Score
- 1.45
- Gender Split
- 60% female / 40% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Delia Sang, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
567 claims
- Brimonidine Tartrate 151
Brimonidine Tartrate
151 claims
- Dorzolamide-Timolol 105
Dorzolamide-Timolol
105 claims
- Prolensa 86
Prolensa
86 claims
- Tobramycin-Dexamet… 49
Tobramycin-Dexamethasone
49 claims
- Timolol Maleate 47
Timolol Maleate
47 claims
- Prednisolone Acetate 36
Prednisolone Acetate
36 claims
- Bromfenac Sodium 23
Bromfenac Sodium
23 claims
| Drug | Claims |
|---|---|
| Latanoprost | 567 |
| Brimonidine Tartrate | 151 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 105 |
| Prolensa Bromfenac Sodium | 86 |
| Tobramycin-Dexamethasone Tobramycin/Dexamethasone | 49 |
| Timolol Maleate | 47 |
| Prednisolone Acetate | 36 |
| Bromfenac Sodium | 23 |
| Alphagan P Brimonidine Tartrate | 21 |
| Difluprednate | 17 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Retina Specialist (Ophthalmology) Physician in MA →
All providers in Massachusetts →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How Delia Sang, MD fits within the Retina Specialist (Ophthalmology) Physician landscape nationally.
913
Retina Specialist (Ophthalmology) Physician Providers in US
48
States with Retina Specialist (Ophthalmology) Physician
558
Avg Claims per Provider
Delia Sang, MD's 1,183 claims are above the specialty average of 558.
Nearby Retina Specialist (Ophthalmology) Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Sang.
Dr. Omar Abdelal
MD
Boston, MA
Dr. Brian Ballios
MD, PHD
Boston, MA
Dr. Fina Barouch
MD
Peabody, MA
Dr. Mark Barsamian
DO
Hopedale, MA
Dr. Lauren Bierman
M.D.
Boston, MA
Compare Retina Specialist (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 Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Retina Specialist (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 Delia Sang, MD's specialty? ▼
Delia Sang, MD specializes in Retina Specialist (Ophthalmology) Physician and practices in Brookline, Massachusetts. Credentials: MD.
How much does Delia Sang, MD prescribe under Medicare Part D? ▼
In 2023, Delia Sang, MD wrote 1,183 Medicare Part D claims totaling $89K in drug costs for 265 beneficiaries.
Where is Delia Sang, MD located? ▼
Delia Sang, MD is located at 1101 BEACON ST, Brookline, MA, 02446. Phone: (617) 731-1760.
What is Delia Sang, MD's NPI number? ▼
Delia Sang, MD's National Provider Identifier (NPI) is 1508842634, issued on 12/20/2005.
Does Delia Sang, MD prescribe more brand-name or generic drugs? ▼
Delia Sang, MD's prescribing is 30% brand-name and 70% generic drugs by claim count, with $67K in brand drug costs.
How many Retina Specialist (Ophthalmology) Physician providers are there in the US? ▼
There are 913 Retina Specialist (Ophthalmology) Physician providers across 48 states in the US. The average Retina Specialist (Ophthalmology) Physician provider writes 558 Medicare Part D claims per year.
What drugs does Delia Sang, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Delia Sang, MD's most frequently prescribed drugs include Latanoprost, Brimonidine Tartrate, Dorzolamide-Timolol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Delia Sang, MD accept Medicare? ▼
Delia Sang, MD appears in CMS Medicare data with 1,183 Part D claims and 265 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Delia Sang, MD's credentials? ▼
Delia Sang, MD's NPI is 1508842634 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.