Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

David Merriott

Ophthalmology β€’ Orange, CA

Active NPI 1588242606 Individual Practitioner Male Practitioner Accepts Medicare assignment
Practice location in NPPES

101 The City Dr S
Orange, CA 928683201

Call 7144565691 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

101 The City Dr S

Orange, CA 928683201

Telephone 7144565691
Organization at the Same NPPES Address or Phone

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Regents Of The University Of California. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Medical School

University Of California, Irvine, California College Of Medicine

Graduation Year

2021

30-day fills

1,801 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$105,690 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $2,735.07 across 11 records.

By nature of payment

  • Travel and Lodging: $1,700.59 across 1 record.
  • Food and Beverage: $1,034.48 across 10 records.

Reporting-company totals (3 largest of 4)

  • Glaukos Corporation: $2,205.78 across 3 records.
  • Mallinckrodt Hospital Products Inc.: $262.10 across 4 records.
  • Alcon Vision LLC: $161.88 across 3 records.

A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.

See the full table

Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).

Guide: How to read an Open Payments record

Years since graduation

5 years (graduated 2021)

CMS Doctors and Clinicians data list 2021 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2021

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, β€œDoes your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

David Merriott has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists David Merriott as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Orange and California

Billing and prescribing volume is not a quality rating.

Medicare Part D prescriptions

More Part D prescriptions than 70% of clinicians listed under Ophthalmology in Orange, CA (2024, 25 clinicians with data). Median for this group: 336. Middle half: 139 to 1,296.

Close to the middle for clinicians listed under Ophthalmology in California (2024, 1,966 clinicians with data). Median for this group: 1,025. Middle half: 297 to 2,233.

Part D drug cost

A higher Part D drug cost than 75% of clinicians listed under Ophthalmology in Orange, CA (2024, 25 clinicians with data). Median for this group: $42,256. Middle half: $8,938 to $105,690.

Close to the middle for clinicians listed under Ophthalmology in California (2024, 1,966 clinicians with data). Median for this group: $79,352. Middle half: $13,075 to $224,408.

37 active clinicians are listed under Ophthalmology with a practice address in Orange, CA (2,902 in California).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Orange

2.7% of these 37 clinicians have the CMS telehealth indicator.

59.5% of these 37 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo Β· Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments Β· Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 – December 31, 2025): 11 records totaling $2,735.07.

Manufacturer Payment Nature Product Type Amount ($)
Glaukos Corporation
Travel and Lodging
Cash or cash equivalent
Travoprost Intraocular Implant - iDose General $1,700.59
Glaukos Corporation
Food and Beverage
Cash or cash equivalent
Radius XR General $352.22
Glaukos Corporation
Food and Beverage
Cash or cash equivalent
iStent infinite General $152.97
Alcon Vision LLC
Food and Beverage
In-kind items and services
Centurion General $150.00
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $118.91
Dompe US, Inc.
Food and Beverage
In-kind items and services
OXERVATE General $105.31
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $87.60
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $34.20
Mallinckrodt Hospital Products Inc.
Food and Beverage
In-kind items and services
ACTHAR General $21.39
Alcon Vision LLC
Food and Beverage
In-kind items and services
TRYPTYR General $8.62
Alcon Vision LLC
Food and Beverage
In-kind items and services
TRYPTYR General $3.26

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D Β· Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Latanoprost Latanoprost 285 12,716 $2,380.56 106
Brimonidine Tartrate Brimonidine Tartrate 167 6,404 $11,870.88 66
Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat 160 9,852 $2,340.78 78
Prednisolone Acetate Prednisolone Acetate 144 4,007 $3,979.28 74
Rhopressa Netarsudil Mesylate 107 3,414 $38,896.50 38
Moxifloxacin Moxifloxacin Hcl 56 821 $1,241.88 35
Timolol Maleate Timolol Maleate 55 2,919 $1,189.79 22
Ketorolac Tromethamine Ketorolac Tromethamine 48 1,234 $836.64 32
Methazolamide Methazolamide 32 970 $2,932.51 12
Restasis Cyclosporine 31 1,210 $24,690.27 11
Erythromycin Erythromycin Base 29 562 $290.21 18
Dorzolamide Hcl Dorzolamide Hcl 24 1,428 $437.53 12
Combigan Brimonidine Tartrate/Timolol 20 684 $4,984.19 β€”
Acetazolamide Acetazolamide 20 415 $379.41 13
Simbrinza Brinzolamide/Brimonidine Tart 19 684 $3,728.67 β€”
Pilocarpine Hcl Pilocarpine Hcl 18 625 $760.60 β€”
Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha 14 208 $155.07 11
Lumigan Bimatoprost 12 470 $4,306.67 β€”
Atropine Sulfate Atropine Sulfate 12 550 $288.09 β€”

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2025-06-13
Ophthalmology Primary Specialty

NUCC Taxonomy Code: 207W00000X

License # reported to NPPES CA A203161

An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Medical Board of California.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - OPHTHALMOLOGY

Medicare Enrollment ID

I20250627002627

Enrollment State Jurisdiction

CA

PECOS Control ID

3072995273

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Regents Of The University Of California

101 The City Dr S, Orange, CA 928683201

Phone: 7144568068

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

7 listed
Millie Arora

Internal Medicine

NPI 1003347527
NPI 1134680390

Doctor of Osteopathic Medicine (D.O.)

NPI 1053948380

Doctor of Medicine (M.D.)

NPI 1043896988

Doctor of Medicine (M.D.), Master of Public Health

Dr. Masaki Nagamine , MD

Psychiatry & Neurology - Vascular Neurology

NPI 1144751660

Doctor of Medicine (M.D.)

Michelle Nguyen

Psychiatry & Neurology - Neurology

NPI 1043896715

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

9 Historical Events
πŸ“
Updated Practice Location June 13, 2025

Registered at 101 THE CITY DR S, ORANGE, CA 928683201 (Tel: 7144565691)

πŸ“
Updated Business Mailing Address June 13, 2025

Registered at 101 THE CITY DR S, ORANGE, CA 928683201

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) June 13, 2025

Ophthalmology (license number reported to NPPES: CA A203161)

βœ…
NPI Profile Active March 30, 2021

NPI status registered as active in NPPES database

πŸ“
Practice Location (Initial Record) March 30, 2021

Registered at 310 E 14TH ST BLDG 6TH, NEW YORK, NY 100034284 (Tel: 2129794181)

πŸ“
Business Mailing Address (Initial Record) March 30, 2021

Registered at 310 E 14TH ST BLDG 6TH, NEW YORK, NY 100034284 (Tel: 2129794181)

πŸ‘€
Provider Name / Credentials (Initial Record) March 30, 2021

Recorded as DAVID MERRIOTT

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) March 30, 2021

Student in an Organized Health Care Education/Training Program

🟒
Initial NPI Registration & Enumeration March 30, 2021

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1588242606
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: March 30, 2021
Last Update: June 13, 2025
Sole Proprietor: No

Other Ophthalmology Specialists in Orange

All Ophthalmology Specialists in Orange

Mailing Address

101 The City Dr S

Orange, CA 928683201

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.