NPI registry status
Active
2026 NPPES data Cornea and External Diseases Specialist Physician NPI 1134155955 M.D.
Verify on CMS → Harvard Riddle, M.D.
Cornea and External Diseases Specialist Physician in Clinton, South Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 294 in Cornea and External Diseases Specialist 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
3K
Medicare Part D claims · 1K beneficiaries · Cornea and External Diseases Specialist Physician avg: 1K
Generic prescribing
44%
generic claims · 56% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$956.45
31 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
Harvard Riddle, M.D. filed 3,220 Medicare Part D claims in 2023 as a Cornea and External Diseases Specialist Physician in Clinton, South Carolina, prescribing 44% generic.
- 3K
- Part D claims, 2023
- 44%
- 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.
Harvard Riddle, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
3,220 Top 11% higher than 89% 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 certification likely (heuristic, not verified)
Harvard Riddle, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Harvard Riddle, M.D.?
Quality data not reportedPrimary specialty
Cornea and External Diseases Specialist Physician
Medicare Part D claims
3,220 161% vs specialty avg
Specialty distribution in South Carolina
How Cornea and External Diseases Specialist Physician compares to other specialties among South Carolina 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 Cornea and External Diseases Specialist 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).
Harvard Riddle, M.D. appears in the CMS NPPES registry as a Cornea and External Diseases Specialist Physician provider holding M.D. credentials at 22995 HIGHWAY 76 E, Clinton, SC, 29325, with a listed phone of (864) 833-0038. NPI 1134155955 was issued on 06/23/2006.
Medicare Part D records for calendar year 2023 show 3,220 prescription claims written by this provider, covering 1,026 Medicare beneficiaries and totaling roughly $388K in drug spend, split 56% brand-name and 44% generic by claim count, with an opioid prescribing rate of 0.5%.
Cornea and External Diseases Specialist Physician is a narrow specialty nationwide, with 294 enrolled providers across 43 states and an average of 1,232 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 | 1134155955 |
|---|---|
| Specialty | Cornea and External Diseases Specialist Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/23/2006 |
Hospital and facility affiliations
Facilities where Harvard Riddle, M.D. 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.
Clemson Eye PA
Greenville, SC
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 Harvard Riddle, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$956
Largest payer
Alcon Vision LLC
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 · Brand-heavy
Harvard Riddle, M.D. - brand share 56.0%
Cornea and External Diseases Specialist Physician average
56% brand-name claims vs 44% generic, on 3,220 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.
3,220
Total Claims
$388K
Total Drug Cost
1,026
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,640
- Total Day Supply
- 119,548
- Brand vs Generic
- 56% brand / 44% generic
- Brand Drug Cost
- $353K
- Generic Drug Cost
- $35K
- Opioid Claims
- 15 (0.5% rate)
- Antibiotic Claims
- 34
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 1.18
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 72, 65-74: 485, 75-84: 364, 85+: 105
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Harvard Riddle, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisolone Acetate
Prednisolone Acetate
822 claims
- Latanoprost
Latanoprost
644 claims
- Prolensa
Prolensa
367 claims
- Brimonidine Tartrate 223
Brimonidine Tartrate
223 claims
- Dorzolamide-Timolol 165
Dorzolamide-Timolol
165 claims
- Neomycin-Polymyxin… 162
Neomycin-Polymyxin-Dexameth
162 claims
- Timolol Maleate 88
Timolol Maleate
88 claims
- Lumigan 80
Lumigan
80 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 822 |
| Latanoprost | 644 |
| Prolensa Bromfenac Sodium | 367 |
| Brimonidine Tartrate | 223 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 165 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 162 |
| Timolol Maleate | 88 |
| Lumigan Bimatoprost | 80 |
| Restasis Cyclosporine | 72 |
| Ketorolac Tromethamine | 68 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Cornea and External Diseases Specialist Physician in SC →
All providers in South Carolina →
Compare specialties →
Cornea and External Diseases Specialist Physician Overview
How Harvard Riddle, M.D. fits within the Cornea and External Diseases Specialist Physician landscape nationally.
294
Cornea and External Diseases Specialist Physician Providers in US
43
States with Cornea and External Diseases Specialist Physician
1,232
Avg Claims per Provider
Harvard Riddle, M.D.'s 3,220 claims are above the specialty average of 1,232.
Nearby Cornea and External Diseases Specialist Physician Providers in South Carolina
Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as Riddle.
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 South Carolina medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Cornea and External Diseases Specialist 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.
Healthcare Guides
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Medical Specialties Explained
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Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
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Virtual care options and coverage in 2026
Explore South Carolina
Frequently Asked Questions
What is Harvard Riddle, M.D.'s specialty? ▼
Harvard Riddle, M.D. specializes in Cornea and External Diseases Specialist Physician and practices in Clinton, South Carolina. Credentials: M.D..
How much does Harvard Riddle, M.D. prescribe under Medicare Part D? ▼
In 2023, Harvard Riddle, M.D. wrote 3,220 Medicare Part D claims totaling $388K in drug costs for 1,026 beneficiaries.
Where is Harvard Riddle, M.D. located? ▼
Harvard Riddle, M.D. is located at 22995 HIGHWAY 76 E, Clinton, SC, 29325. Phone: (864) 833-0038.
What is Harvard Riddle, M.D.'s NPI number? ▼
Harvard Riddle, M.D.'s National Provider Identifier (NPI) is 1134155955, issued on 06/23/2006.
Does Harvard Riddle, M.D. prescribe more brand-name or generic drugs? ▼
Harvard Riddle, M.D.'s prescribing is 56% brand-name and 44% generic drugs by claim count, with $353K in brand drug costs.
Does Harvard Riddle, M.D. prescribe opioids? ▼
Yes, Harvard Riddle, M.D. had 15 opioid claims in 2023 with an opioid prescribing rate of 0.5%.
How many Cornea and External Diseases Specialist Physician providers are there in the US? ▼
There are 294 Cornea and External Diseases Specialist Physician providers across 43 states in the US. The average Cornea and External Diseases Specialist Physician provider writes 1,232 Medicare Part D claims per year.
What drugs does Harvard Riddle, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Harvard Riddle, M.D.'s most frequently prescribed drugs include Prednisolone Acetate, Latanoprost, Prolensa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Harvard Riddle, M.D. accept Medicare? ▼
Harvard Riddle, M.D. appears in CMS Medicare data with 3,220 Part D claims and 1,026 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Harvard Riddle, M.D.'s credentials? ▼
Harvard Riddle, M.D.'s NPI is 1134155955 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.