Aron R Baum , PA-C
Physician Assistant • Mill Valley, CA
750 Redwood Hwy Frontage Rd Ste 1204
Mill Valley, CA 949412483
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 June 22, 2017; this date does not establish years in practice.
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Published CMS data list 57 Original Medicare Part B services in 2021.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021. Published rows only; this is not a quality measure.
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Published Part B service records, 2021:
- 99202 — New patient outpatient office visit: 29 service units.
- 99212 — Established patient outpatient office visit: 15 service units.
- 99203 — New patient outpatient office visit: 13 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2020 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2021). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 22 Medicare Part D prescriptions, including refills, in 2020.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Published rows only; this is not a quality measure.
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Published Part D records, 2020:
- Ibuprofen — 22 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. 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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Medicare Part D prescriptions went from 33 in 2018 to 22 in 2020.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2018–2020.
Practice Location & Contact Primary Location
750 Redwood Hwy Frontage Rd Ste 1204
Mill Valley, CA 949412483
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: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $4,557 in 2021
The total amount Medicare approved for these services in 2021. 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, 2021.
Paid by Medicare
About $4,332 in 2021
The part of the Medicare-allowed amount that Medicare itself paid in 2021, 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, 2021.
30-day fills
22 standardized 30-day fills in 2020
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
$71 in 2020
The total cost of these prescriptions in 2020, 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, 2020.
Open Payments general payments, program year 2022
All general payments: $266.00 across 2 records.
By nature of payment
- Education: $250.00 across 1 record.
- Food and Beverage: $16.00 across 1 record.
Reporting-company totals
- Intuitive Surgical, Inc.: $266.00 across 2 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.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2022 (published June 30, 2026).
NPI first issued
2017
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.
Enrolled in Medicare (PECOS)
Aron Baum 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 Aron Baum 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 Mill Valley and California
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Aron Baum are from 2021.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Aron Baum are from 2020.
9 active clinicians are listed under Physician Assistant with a practice address in Mill Valley, CA (14,458 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
CMS data for Medicare Part B services are available for 2021 only.
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Medicare-allowed amount
CMS data for Medicare-allowed amount are available for 2021 only.
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Paid by Medicare
CMS data for Medicare payment amount are available for 2021 only.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 33% from 33 in 2018 to 22 in 2020.
- 2018: 33
- 2019: 82
- 2020: 22
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30-day fills
30-day fills decreased 35% from 34 in 2018 to 22 in 2020.
- 2018: 34
- 2019: 82
- 2020: 22
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Part D drug cost
Part D drug cost went from $137 in 2018 to $71 in 2020.
- 2018: $137
- 2019: $319
- 2020: $71
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $6.37 in 2021 to $266.00 in 2022.
- 2021: $6.37
- 2022: $266.00
Sources: CMS Medicare Physician & Other Practitioners (2021), CMS Medicare Part D Prescribers (2020), CMS Open Payments (2022), 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 2022 (payments made January 1 – December 31, 2022): fewer than 11 records totaling $266.00.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Intuitive Surgical, Inc. |
Education
In-kind items and services
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DAVINCI XI | General | $250.00 |
| Intuitive Surgical, Inc. |
Food and Beverage
In-kind items and services
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Da Vinci Surgical System | General | $16.00 |
Source: CMS Open Payments, program year 2022, 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 2020 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, 2021; 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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99202
New patient office or other outpatient visit with straightforward medical decision making, if using time, 15 minutes or more
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29 | 29 | $241.00 | $75.59 |
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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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15 | 15 | $165.00 | $58.67 |
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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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13 | 13 | $400.00 | $114.24 |
Source: CMS Part B by Provider and Service, 2021; 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 2020.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Ibuprofen | Ibuprofen | 22 | 181 | $71.07 | 22 |
Source: CMS Part D by Provider and Drug, 2020; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2022-07-01NUCC Taxonomy Code: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20181017001637
CA
4486906583
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.
Emergency Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Advanced Practice Nurse
Nurse Practitioner - Family
Doctor of Nursing Practice, Family Nurse Practitioner (Certified)
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant (Certified)
Family Medicine - Sports Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 2238 GEARY BLVD, SAN FRANCISCO, CA 941153416
Registered at 750 REDWOOD HWY FRONTAGE RD STE 1204, MILL VALLEY, CA 949412483 (Tel: 4153844778)
Registered at 3400 DATA DR, ATTN CREDENTIALING/PAYER ENROLLMENT, RANCHO CORDOVA, CA 956707956
Recorded as ARON BAUM, PA-C
NPI status registered as active in NPPES database
Registered at 751 S BASCOM AVE, SAN JOSE, CA 951282604 (Tel: 4088855000)
Registered at 2427 FREETOWN DR, RESTON, VA 201912511
Recorded as ARON BAUM
Physician Assistant
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Mill Valley
- Thomas Brookshire, PA
- Alexis Martinez, PA-C
- Jason Justin, PA-C
- Aaron Lanes, PA-C, MPH, MSPAS
- Tana Summers, PA
- Diana Saylor, PA-C
Mailing Address
2238 Geary Blvd
San Francisco, CA 941153416