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Edit this profileAt a glance
- 100 W California Blvd, Pasadena, CA 91105
About Dr. Maas
David S. Maas, MD is listed as a student in an organized health care education program in Pasadena, CA. David is a 2018 graduate of Creighton University School of Medicine. According to Medicare claims data, David cared for 139 Medicare patients across 179 services. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes, and established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more. The provider's National Provider Identifier (NPI) is 1538653688.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (626) 421-7733
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
100 W CALIFORNIA BLVD
Pasadena, CA 91105
Procedures Most Often Billed to Medicare
179 services · 139 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
58 | As often as other peers in Student in training |
| Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | Office visit | 99221 |
36 | More often than most peers in Student in training |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
28 | More often than most peers in Student in training |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
24 | As often as other peers in Student in training |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
18 | Less often than most peers in Student in training |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
15 | Less often than most peers in Student in training |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other medical trainees at this location 8
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other medical trainees in Pasadena 8
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Creighton University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2018 at Creighton University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What kind of doctor is Dr. Maas?
Dr. Maas is a medical trainee in Pasadena, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Student in an Organized Health Care Education Program”.
NPI registry
What is Dr. Maas's address?
Dr. Maas is listed at 100 W California Blvd, Pasadena, CA 91105. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Maas?
The number on file is (626) 421-7733. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Dr. Maas's NPI number?
Dr. Maas's National Provider Identifier is 1538653688. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Maas train?
Dr. Maas attended Creighton University School of Medicine, graduating in 2018. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Maas been practicing?
Dr. Maas has 8 years experience. Calculated from a graduation year of 2018, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Maas perform?
According to Medicare billing data, Dr. Maas the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Maas confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Maas. If this is you, claiming it is free.
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