Dr. Martin Guadalupe Perez , MD
Surgery • Riverside, CA
7117 Brockton Ave
Riverside, CA 925062658
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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NPI assigned on December 2, 2010; this date does not establish years in practice.
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Published CMS data list 333 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:
- 99233 — Subsequent hospital care with moderate levelof medical decision making: 118 service units.
- 99223 — Initial hospital care with moderate level of medical decision making: 66 service units.
- 99232 — Subsequent hospital care with moderate levelof medical decision making: 39 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 9 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 77 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:
- Tramadol Hcl — 47 prescription fills, including refills.
- Pantoprazole Sodium — 16 prescription fills, including refills.
- Nystatin — 14 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 the full table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 80% of clinicians listed under Surgery in Riverside, CA (2024, 23 clinicians with data). Median for this group: 141. Middle half: 41 to 317.
More Medicare Part B services than 65% of clinicians listed under Surgery in California (2024, 1,332 clinicians with data). Median for this group: 213. Middle half: 102 to 403.
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 136 in 2020 to 333 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
7117 Brockton Ave
Riverside, CA 925062658
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in York, PA. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 2 distinct group names: Riverside Medical Clinic Inc; Western Acute Care Surgeons Inc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
University Of Illinois College Of Med (Chi/peor/rock/chm-Urb)
2010
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
174 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 $42,352 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 $33,302 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
88 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
$544 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.
Open Payments general payments, program year 2024
All general payments: $572.95 across 6 records.
By nature of payment
- Travel and Lodging: $383.87 across 3 records.
- Food and Beverage: $189.08 across 3 records.
Reporting-company totals
- Medical Device Business Services, Inc.: $499.06 across 4 records.
- Ethicon Inc.: $50.87 across 1 record.
- Medtronic, Inc.: $23.02 across 1 record.
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.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2024 (published June 30, 2026).
Years since graduation
16 years (graduated 2010)
CMS Doctors and Clinicians data list 2010 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished 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, CMS release of October 2, 2026.
NPI first issued
2010
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.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
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. Perez 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. Perez 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 Riverside and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 80% of clinicians listed under Surgery in Riverside, CA (2024, 23 clinicians with data). Median for this group: 141. Middle half: 41 to 317.
More Medicare Part B services than 65% of clinicians listed under Surgery in California (2024, 1,332 clinicians with data). Median for this group: 213. Middle half: 102 to 403.
Medicare-allowed amount
A higher Medicare-allowed amount than 80% of clinicians listed under Surgery in Riverside, CA (2024, 23 clinicians with data). Median for this group: $19,371. Middle half: $7,031 to $36,857.
Close to the middle for clinicians listed under Surgery in California (2024, 1,332 clinicians with data). Median for this group: $32,273. Middle half: $13,192 to $65,819.
Paid by Medicare
A higher Medicare payment amount than 80% of clinicians listed under Surgery in Riverside, CA (2024, 23 clinicians with data). Median for this group: $14,633. Middle half: $5,544 to $28,882.
Close to the middle for clinicians listed under Surgery in California (2024, 1,332 clinicians with data). Median for this group: $24,805. Middle half: $10,200 to $50,338.
Medicare Part D prescriptions
More Part D prescriptions than 60% of clinicians listed under Surgery in Riverside, CA (2024, 31 clinicians with data). Median for this group: 56. Middle half: 30 to 120.
More Part D prescriptions than 60% of clinicians listed under Surgery in California (2024, 1,324 clinicians with data). Median for this group: 54. Middle half: 26 to 102.
Part D drug cost
A higher Part D drug cost than 60% of clinicians listed under Surgery in Riverside, CA (2024, 31 clinicians with data). Median for this group: $466. Middle half: $115 to $1,049.
A higher Part D drug cost than 60% of clinicians listed under Surgery in California (2024, 1,324 clinicians with data). Median for this group: $345. Middle half: $125 to $1,120.
54 active clinicians are listed under Surgery with a practice address in Riverside, CA (3,129 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Riverside
5.6% of these 54 clinicians have the CMS telehealth indicator.
68.5% of these 54 clinicians are listed by CMS as accepting Medicare assignment.
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 increased 145% from 136 in 2020 to 333 in 2024.
- 2020: 136
- 2021: 142
- 2022: 144
- 2023: 181
- 2024: 333
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Medicare-allowed amount
Medicare-allowed amount increased 293% from $10,779 in 2020 to $42,352 in 2024.
- 2020: $10,779
- 2021: $11,318
- 2022: $12,673
- 2023: $17,477
- 2024: $42,352
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Paid by Medicare
Paid by Medicare increased 292% from $8,500 in 2020 to $33,302 in 2024.
- 2020: $8,500
- 2021: $8,851
- 2022: $9,547
- 2023: $13,492
- 2024: $33,302
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 20% from 96 in 2020 to 77 in 2024.
- 2020: 96
- 2021: 82
- 2022: 100
- 2023: 34
- 2024: 77
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30-day fills
30-day fills decreased 14% from 102 in 2020 to 88 in 2024.
- 2020: 102
- 2021: 118
- 2022: 131
- 2023: 34
- 2024: 88
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Part D drug cost
Part D drug cost decreased 55% from $1,207 in 2020 to $544 in 2024.
- 2020: $1,207
- 2021: $1,182
- 2022: $2,315
- 2023: $47
- 2024: $544
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $120.95 in 2020 to $572.95 in 2024.
- 2020: $120.95
- 2021: $8,229.97
- 2022: $4,009.56
- 2023: $9,134.87
- 2024: $572.95
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 $572.95.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Medical Device Business Services, Inc. |
Travel and Lodging
In-kind items and services
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— | General | $325.63 |
| Medical Device Business Services, Inc. |
Food and Beverage
In-kind items and services
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— | General | $115.19 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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ECHELON ENDOPATH | General | $50.87 |
| Medical Device Business Services, Inc. |
Travel and Lodging
In-kind items and services
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— | General | $33.24 |
| Medical Device Business Services, Inc. |
Travel and Lodging
In-kind items and services
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— | General | $25.00 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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SIGNIA | General | $23.02 |
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 2017–2023 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, 2018–2024; 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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99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
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118 | 50 | $2592.20 | $118.60 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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66 | 58 | $2861.36 | $173.25 |
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99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
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39 | 30 | $217.38 | $78.24 |
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99222
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
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23 | 22 | $292.83 | $129.93 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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20 | 15 | $231.00 | $131.90 |
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99291
Critical care, first 30-74 minutes
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19 | 11 | $3562.74 | $211.49 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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18 | 18 | $200.94 | $114.60 |
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45380
Biopsy of large bowel using a flexible endoscope
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16 | 15 | $687.50 | $130.29 |
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G0500
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito
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14 | 13 | $11.22 | $5.63 |
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 |
|---|---|---|---|---|---|
| Tramadol Hcl | Tramadol Hcl | 47 | 148 | $61.40 | 46 |
| Pantoprazole Sodium | Pantoprazole Sodium | 16 | 810 | $174.55 | — |
| Nystatin | Nystatin | 14 | 420 | $307.73 | — |
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: 2025-04-14NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20180215000838
CA
5597947002
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, CMS release of October 2, 2026
Western Acute Care Surgeons Inc
2101 N Waterman Ave, San Bernardino, CA 924044836
Phone: 9093273288
Western Acute Care Surgeons Inc
401 E Highland Ave, San Bernardino, CA 924043830
Phone: 9098207200
Riverside Medical Clinic Inc
7117 Brockton Ave, Riverside, CA 925062658
Phone: 9516836370
Secondary Practice Locations
1001 South George St
York, PA 174057198
Phone: 7178514362
1001 South George St
York, PA 174057198
Phone: 7178514362
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery
Doctor of Osteopathic Medicine (D.O.)
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Additional practice office at 1001 South George st, York, PA 174057198
Registered at 7117 BROCKTON AVE, RIVERSIDE, CA 925062658 (Tel: 9517823650)
NPI status registered as active in NPPES database
Registered at 7117 BROCKTON AVE, RIVERSIDE, CA 925062658 (Tel: 9513216355)
Registered at 3660 ARLINGTON AVE, RIVERSIDE, CA 925063912 (Tel: 9513216355)
Recorded as MARTIN PEREZ, M.D.
Surgery (license number reported to NPPES: CA A148965)
NPI status registered as active in NPPES database
Registered at 1001 SOUTH GEORGE ST, YORK, PA 174057198 (Tel: 7178514362)
Registered at 1001 SOUTH GEORGE ST, PO BOX 15198, YORK, PA 174057198 (Tel: 7178514362)
Recorded as MARTIN PEREZ, M.D.
Surgery (license number reported to NPPES: PA MT199832)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Surgery Specialists in Riverside
- Dr. Andrew Mccague, DO, FACOS, FACS
- Dr. Aaron Lee, DO
- Dr. Sunhee Kim, MD
- Dr. Aras Emdadi, DO
- Dr. Harvey Nurick, MD
- Dr. John Husted, MD
Mailing Address
7117 Brockton Ave
Riverside, CA 925062658
Phone: 9517823650