Ruby Guzman Yamamoto , PA-C
Physician Assistant - Medical • Chicago, IL
5086 N Elston Ave
Chicago, IL 606302427
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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Ruby Yamamoto is listed in NPPES under Physician Assistant - Medical.
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NPI assigned on September 10, 2009; this date does not establish years in practice.
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Published CMS data list 1,748 Original Medicare Part B services in 2017.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017. Published rows only; this is not a quality measure.
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Published Part B service records, 2017:
- 99350 — Residence visit for established patient with high level of medical decision making, per day: 1,053 service units.
- G0181 — Physician or allowed practitioner supervision of a patient receiving medicare-covered services provided by a participating home health agency (patient not present) requiring complex and multidisciplinary care modalities involving regular physician or allow: 389 service units.
- 99349 — Residence visit for established patient with moderate level of medical decision making, per day: 234 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2016 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2017). CPT notice
See all 5 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 67 Medicare Part D prescriptions, including refills, in 2021.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2021. Published rows only; this is not a quality measure.
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Published Part D records, 2021:
- Losartan Potassium — 18 prescription fills, including refills.
- Hydrochlorothiazide — 13 prescription fills, including refills.
- Levothyroxine Sodium — 13 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2021. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 5 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 6,286 in 2017 to 67 in 2021.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2017–2021.
Practice Location & Contact Primary Location
5086 N Elston Ave
Chicago, IL 606302427
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
Physician Assistant - Medical: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $235,526 in 2017
The total amount Medicare approved for these services in 2017. 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, 2017.
Paid by Medicare
About $181,569 in 2017
The part of the Medicare-allowed amount that Medicare itself paid in 2017, 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, 2017.
30-day fills
132 standardized 30-day fills in 2021
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
$749 in 2021
The total cost of these prescriptions in 2021, 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, 2021.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $20.68 in 2021
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 2021.
NPI first issued
2009
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; 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.
Compared with the same specialty in Chicago and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Ruby Yamamoto are from 2017.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Ruby Yamamoto are from 2021.
175 active clinicians are listed under Physician Assistant - Medical with a practice address in Chicago, IL (671 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
10.9% of these 175 clinicians have the CMS telehealth indicator.
46.9% of these 175 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
CMS data for Medicare Part B services are available for 2017 only.
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Medicare-allowed amount
CMS data for Medicare-allowed amount are available for 2017 only.
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Paid by Medicare
CMS data for Medicare payment amount are available for 2017 only.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 99% from 6,286 in 2017 to 67 in 2021.
- 2017: 6,286
- 2018: 378
- 2019: 24
- 2020: 24
- 2021: 67
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30-day fills
30-day fills decreased 98% from 8,597 in 2017 to 132 in 2021.
- 2017: 8,597
- 2018: 680
- 2019: 24
- 2020: 24
- 2021: 132
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Part D drug cost
Part D drug cost decreased 100% from $823,028 in 2017 to $749 in 2021.
- 2017: $823,028
- 2018: $7,982
- 2019: $278
- 2020: $233
- 2021: $749
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2021 only.
Sources: CMS Medicare Physician & Other Practitioners (2017), CMS Medicare Part D Prescribers (2021), CMS Open Payments (2021), CMS Doctors and Clinicians, 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 2021 (payments made January 1 – December 31, 2021): fewer than 11 records totaling $20.68.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Merck Sharp & Dohme Corporation |
Food and Beverage
In-kind items and services
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NEXPLANON | General | $20.68 |
Source: CMS Open Payments, program year 2021, 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 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; 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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99350
Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes
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1,053 | 307 | $200.00 | $160.62 |
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G0181
Physician or allowed practitioner supervision of a patient receiving medicare-covered services provided by a participating home health agency (patient not present) requiring complex and multidisciplinary care modalities involving regular physician or allow
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389 | 186 | $120.00 | $96.97 |
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99349
Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes
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234 | 132 | $150.00 | $115.81 |
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G0008
Administration of influenza virus vaccine
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36 | 36 | $32.00 | $26.42 |
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Q2037
Influenza virus vaccine, split virus, when administered to individuals 3 years of age and older, for intramuscular use (fluvirin)
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36 | 36 | $22.00 | $17.26 |
Source: CMS Part B by Provider and Service, 2017; 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 2021.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Losartan Potassium | Losartan Potassium | 18 | 1,260 | $150.85 | — |
| Hydrochlorothiazide | Hydrochlorothiazide | 13 | 810 | $59.92 | — |
| Levothyroxine Sodium | Levothyroxine Sodium | 13 | 720 | $338.68 | — |
| Trazodone Hcl | Trazodone Hcl | 12 | 600 | $87.20 | — |
| Omeprazole | Omeprazole | 11 | 570 | $112.18 | — |
Source: CMS Part D by Provider and Drug, 2021; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 363AM0700X
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Ophthalmology
Ophthalmology - Retina Specialist
Doctor of Medicine (M.D.)
Ophthalmology - Cornea and External Diseases Specialist
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated September 10, 2009.
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 August 2026.
NPI Administrative Meta
Other Physician Assistant - Medicals in Chicago
- Joseph Smith, PA-C
- Cindy Tong, PA
- Matthew Coello, PA-C
- Stephanie Lemus, PA-C
- Ethan Hixson, PA-C
- Jenna Sniegowski, PA-C
Mailing Address
5415 N Sheridan Rd, Apt 911
Chicago, IL 606401969
Phone: 7084081324