Dr. Robert Stephen Grosserode , MD
Ophthalmology • Antioch, CA
3747 Sunset Ln
Antioch, CA 945096101
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Robert Grosserode is listed in NPPES under Ophthalmology.
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NPI assigned on February 19, 2007; this date does not establish years in practice.
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Published CMS data list 564 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 92014 — Established patient complete exam of visual system: 280 service units.
- 92012 — Established patient problem focused exam of visual system: 127 service units.
- 92004 — New patient complete exam of visual system: 64 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 7 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 564 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Latanoprost — 309 prescription fills, including refills.
- Dorzolamide Hcl — 62 prescription fills, including refills.
- Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) — 51 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 7 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 75% of clinicians listed under Ophthalmology in California (2024, 1,565 clinicians with data). Median for this group: 1,809. Middle half: 610 to 3,924.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 2,974 in 2020 to 564 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
3747 Sunset Ln
Antioch, CA 945096101
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Ophthalmology: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
465 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $76,085 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $39,040 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
1,289 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
$34,536 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
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.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $25.83 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
NPI first issued
2007
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, CMS release of October 2, 2026; Medicare.gov, “Does your provider accept Medicare as full payment?”
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, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Dr. Grosserode 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.
Can order Medicare-covered services
CMS lists Dr. Grosserode 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.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
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.
Compared with the same specialty in Antioch and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 75% of clinicians listed under Ophthalmology in California (2024, 1,565 clinicians with data). Median for this group: 1,809. Middle half: 610 to 3,924.
Too few clinicians listed under Ophthalmology in Antioch have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A lower Medicare-allowed amount than 70% of clinicians listed under Ophthalmology in California (2024, 1,565 clinicians with data). Median for this group: $211,388. Middle half: $68,829 to $437,611.
Too few clinicians listed under Ophthalmology in Antioch have Medicare Part B data for 2024 to compare.
Paid by Medicare
A lower Medicare payment amount than 75% of clinicians listed under Ophthalmology in California (2024, 1,565 clinicians with data). Median for this group: $154,209. Middle half: $49,511 to $322,825.
Too few clinicians listed under Ophthalmology in Antioch have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
Fewer Part D prescriptions than 60% of clinicians listed under Ophthalmology in California (2024, 1,957 clinicians with data). Median for this group: 1,028. Middle half: 301 to 2,235.
Too few clinicians listed under Ophthalmology in Antioch have Medicare Part D data for 2024 to compare.
Part D drug cost
A lower Part D drug cost than 60% of clinicians listed under Ophthalmology in California (2024, 1,957 clinicians with data). Median for this group: $79,624. Middle half: $13,457 to $224,976.
Too few clinicians listed under Ophthalmology in Antioch have Medicare Part D data for 2024 to compare.
6 active clinicians are listed under Ophthalmology with a practice address in Antioch, CA (2,891 in California).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 81% from 2,974 in 2020 to 564 in 2024.
- 2020: 2,974
- 2021: 3,330
- 2022: 3,191
- 2023: 2,477
- 2024: 564
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Medicare-allowed amount
Medicare-allowed amount decreased 82% from $413,537 in 2020 to $76,085 in 2024.
- 2020: $413,537
- 2021: $434,512
- 2022: $398,448
- 2023: $285,676
- 2024: $76,085
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Paid by Medicare
Paid by Medicare decreased 86% from $286,993 in 2020 to $39,040 in 2024.
- 2020: $286,993
- 2021: $308,718
- 2022: $275,846
- 2023: $191,916
- 2024: $39,040
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 85% from 3,663 in 2020 to 564 in 2024.
- 2020: 3,663
- 2021: 3,473
- 2022: 3,217
- 2023: 2,215
- 2024: 564
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30-day fills
30-day fills decreased 78% from 5,926 in 2020 to 1,289 in 2024.
- 2020: 5,926
- 2021: 5,998
- 2022: 5,539
- 2023: 4,517
- 2024: 1,289
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Part D drug cost
Part D drug cost decreased 86% from $242,967 in 2020 to $34,536 in 2024.
- 2020: $242,967
- 2021: $251,022
- 2022: $237,752
- 2023: $207,631
- 2024: $34,536
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $42.06 in 2019 to $25.83 in 2024.
- 2019: $42.06
- 2021: $14.78
- 2022: $24.04
- 2024: $25.83
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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
Program year 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $25.83.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| ABBVIE INC. |
Food and Beverage
In-kind items and services
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DURYSTA | General | $25.83 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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92014
Established patient complete exam of visual system
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280 | 277 | $200.00 | $158.36 |
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92012
Established patient problem focused exam of visual system
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127 | 102 | $140.00 | $113.25 |
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92004
New patient complete exam of visual system
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64 | 64 | $250.00 | $186.42 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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33 | 30 | $100.00 | $69.62 |
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92083
Exam of visual field with extended testing
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26 | 24 | $285.00 | $78.21 |
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92133
Imaging of optic nerve
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23 | 22 | $150.00 | $41.27 |
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76514
Ultrasound scan of cornea to determine thickness
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11 | 11 | $70.00 | $13.64 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Latanoprost | Latanoprost | 309 | 21,825 | $4,785.83 | 137 |
| Dorzolamide Hcl | Dorzolamide Hcl | 62 | 4,626 | $1,408.22 | 33 |
| Dorzolamide-Timolol | Dorzolamide Hcl/Timolol Maleat | 51 | 3,640 | $788.65 | 21 |
| Timolol Maleate | Timolol Maleate | 44 | 2,611 | $528.96 | 20 |
| Rhopressa | Netarsudil Mesylate | 43 | 1,547 | $16,607.29 | 18 |
| Brimonidine Tartrate | Brimonidine Tartrate | 41 | 2,828 | $1,299.54 | 22 |
| Lumigan | Bimatoprost | 14 | 1,095 | $9,117.50 | — |
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
NUCC Taxonomy Code: 207W00000X
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.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - OPHTHALMOLOGY
I20080711000556
CA
6608769633
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Optometrist
Doctor of Optometry
Optometrist
Doctor of Optometry
Ophthalmology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated February 19, 2007.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to November 2026.
NPI Administrative Meta
Other Ophthalmology Specialists in Antioch
- Dr. Alexander Wang, MD
- Dr. Susan Jew, MD
- Dr. Ivan Hwang, MD
- Dr. Suraj Cherry, MD
- Dr. Daniel Greninger, MD
Mailing Address
3747 Sunset Ln
Antioch, CA 945096101
Phone: 9257542300