Derek Asimus
Physician Assistant โข Pasadena, CA
797 S Fair Oaks Ave
Pasadena, CA 911052617
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 January 24, 2016; this date does not establish years in practice.
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Published CMS data list 281 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99204 โ New patient outpatient office visit: 68 service units.
- 99213 โ Established patient outpatient office visit: 36 service units.
- 85025 โ Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count: 31 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ 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 11 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 330 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Doxycycline Hyclate โ 57 prescription fills, including refills.
- Albuterol Sulfate Hfa (Albuterol Sulfate) โ 56 prescription fills, including refills.
- Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) โ 48 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 12 records in the table ยท Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Physician Assistant in Pasadena, CA (2024, 30 clinicians with data). Median for this group: 287. Middle half: 146 to 578.
Close to the middle for Medicare Part B services among clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: 198. Middle half: 71 to 535.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 22 in 2020 to 281 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
797 S Fair Oaks Ave
Pasadena, CA 911052617
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Exer Medical Corporation. 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
2015
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
169 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 โ by Provider, 2024.
Medicare-allowed amount
About $22,697 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 โ by Provider and Service, 2024.
Paid by Medicare
About $16,605 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 โ by Provider and Service, 2024.
30-day fills
332 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
$2,580 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 โ by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2021โ2025.
Years since graduation
11 years (graduated 2015)
CMS Doctors and Clinicians data list 2015 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.
NPI first issued
2016
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; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
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)
Derek Asimus 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 Derek Asimus 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 Pasadena and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Physician Assistant in Pasadena, CA (2024, 30 clinicians with data). Median for this group: 287. Middle half: 146 to 578.
Close to the middle for clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: 198. Middle half: 71 to 535.
Medicare-allowed amount
Close to the middle for clinicians listed under Physician Assistant in Pasadena, CA (2024, 30 clinicians with data). Median for this group: $23,358. Middle half: $8,934 to $31,419.
Close to the middle for clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: $18,173. Middle half: $6,666 to $41,587.
Paid by Medicare
Close to the middle for clinicians listed under Physician Assistant in Pasadena, CA (2024, 30 clinicians with data). Median for this group: $16,605. Middle half: $6,887 to $24,274.
Close to the middle for clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: $13,209. Middle half: $4,792 to $30,879.
Medicare Part D prescriptions
More Part D prescriptions than 65% of clinicians listed under Physician Assistant in Pasadena, CA (2024, 47 clinicians with data). Median for this group: 162. Middle half: 44 to 538.
Close to the middle for clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: 229. Middle half: 72 to 718.
Part D drug cost
Close to the middle for clinicians listed under Physician Assistant in Pasadena, CA (2024, 47 clinicians with data). Median for this group: $3,264. Middle half: $245 to $15,962.
Close to the middle for clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: $3,945. Middle half: $709 to $60,209.
88 active clinicians are listed under Physician Assistant with a practice address in Pasadena, CA (14,458 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Pasadena
10.2% of these 88 clinicians have the CMS telehealth indicator.
40.9% of these 88 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 1177% from 22 in 2020 to 281 in 2024.
- 2020: 22
- 2021: 96
- 2022: 141
- 2023: 81
- 2024: 281
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Medicare-allowed amount
Medicare-allowed amount increased 913% from $2,240 in 2020 to $22,697 in 2024.
- 2020: $2,240
- 2021: $6,939
- 2022: $13,365
- 2023: $8,377
- 2024: $22,697
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Paid by Medicare
Paid by Medicare increased 677% from $2,138 in 2020 to $16,605 in 2024.
- 2020: $2,138
- 2021: $6,299
- 2022: $12,076
- 2023: $6,211
- 2024: $16,605
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 105% from 161 in 2023 to 330 in 2024.
- 2023: 161
- 2024: 330
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30-day fills
30-day fills increased 106% from 161 in 2023 to 332 in 2024.
- 2023: 161
- 2024: 332
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Part D drug cost
Part D drug cost increased 57% from $1,643 in 2023 to $2,580 in 2024.
- 2023: $1,643
- 2024: $2,580
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2019โ2023 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 โ by Provider and Service data, 2020โ2024; 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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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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68 | 68 | $365.99 | $150.55 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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36 | 35 | $180.06 | $83.21 |
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85025
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count
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31 | 31 | $25.45 | $7.61 |
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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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29 | 29 | $258.07 | $117.40 |
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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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23 | 23 | $234.17 | $102.21 |
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80047
Blood test, basic group of blood chemicals (calcium, ionized)
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21 | 21 | $35.19 | $13.46 |
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81002
Urinalysis, manual test
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21 | 21 | $9.76 | $3.41 |
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96372
Injection of drug or substance under skin or into muscle
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15 | 15 | $47.80 | $13.37 |
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87426
Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus
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14 | 14 | $140.43 | $34.62 |
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99205
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
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12 | 12 | $476.08 | $200.77 |
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81003
Automated urinalysis test
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11 | 11 | $8.91 | $2.20 |
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 |
|---|---|---|---|---|---|
| Doxycycline Hyclate | Doxycycline Hyclate | 57 | 381 | $332.35 | 57 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 56 | 1,196 | $871.88 | 56 |
| Amoxicillin-Clavulanate Potass | Amoxicillin/Potassium Clav | 48 | 339 | $278.70 | 47 |
| Cephalexin | Cephalexin | 32 | 188 | $462.69 | 32 |
| Sulfamethoxazole-Trimethoprim | Sulfamethoxazole/Trimethoprim | 26 | 179 | $75.39 | 23 |
| Azithromycin | Azithromycin | 21 | 105 | $52.56 | 21 |
| Ofloxacin | Ofloxacin | 19 | 152 | $139.24 | 16 |
| Mupirocin | Mupirocin | 18 | 296 | $117.86 | 17 |
| Naproxen | Naproxen | 16 | 85 | $69.47 | 16 |
| Methylprednisolone | Methylprednisolone | 13 | 79 | $82.42 | 13 |
| Ciprofloxacin Hcl | Ciprofloxacin Hcl | 12 | 105 | $50.61 | 12 |
| Triamcinolone Acetonide | Triamcinolone Acetonide | 12 | 331 | $46.81 | 12 |
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: 2023-06-20NUCC 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
I20180829003784
CA
9537419221
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
Exer Medical Corporation
26777 Agoura Rd, Calabasas, CA 913022967
Phone: 8188802225
Exer Medical Corporation
359 Carmen Dr, Camarillo, CA 930106033
Phone: 8059145592
Exer Medical Corporation
701 N Wendy Dr, Newbury Park, CA 913203066
Phone: 8053754400
Exer Medical Corporation
797 S Fair Oaks Ave, Pasadena, CA 911052617
Phone: 6263851455
Exer Medical Corporation
475 Foothill Blvd, La Canada, CA 910113555
Phone: 8185286377
Exer Medical Corporation
6440 Platt Ave, West Hills, CA 913073216
Phone: 8189461103
Exer Medical Corporation
600 S Lake Ave, Pasadena, CA 911063955
Phone: 6268448848
Exer Medical Corporation
23341 Mulholland Dr, Woodland Hills, CA 913642734
Phone: 8186370048
Exer Medical Corporation
111 S Westlake Blvd, Westlake Village, CA 913623807
Phone: 8055578177
Exer Medical Corporation
215 N Allen Ave, Pasadena, CA 911061601
Phone: 6268179002
Exer Medical Corporation
20201 Rinaldi St, Northridge, CA 913264938
Phone: 7474444901
Exer Medical Corporation
35 W Los Angeles Ave, Moorpark, CA 930211820
Phone: 8055295370
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Family Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Physician Assistant - Medical
Physician Assistant
Family Medicine
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.), Master of Public Health
Physician Assistant
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 797 S FAIR OAKS AVE, PASADENA, CA 911052617 (Tel: 6267972244)
NPI status registered as active in NPPES database
Registered at 6430 SELMA AVE, HOLLYWOOD, CA 900287311 (Tel: 3238484522)
Registered at 616 W ROSES RD, SAN GABRIEL, CA 917752231
Recorded as DEREK ASIMUS
Physician Assistant (license number reported to NPPES: CA 53155)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Physician Assistants in Pasadena
- Melissa Real
- Alexandra Spooner, PA
- Virginia Mabasa, PA
- Helen Lam, PA-C
- Shayani Cailleteau, PA-C
- Isabella Murray, PA
Mailing Address
616 W Roses Rd
San Gabriel, CA 917752231