Melissa Udell, PH.D.
Melissa Udell, PH.D. is a Psychologist in Pasadena, CA, registered under NPI 1003045527. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Pasadena, based on OpenStreetMap data collected Sep 1, 2026. Parking is available about 899 ft away. There is EV charging 0.20 mi from the office (Tesla Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 1,022 ft away. A pharmacy sits 0.48 mi from the entrance (Cal Oaks Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.33 mi away.
Getting here and what is nearby
Restaurant Buffalo Wild Wings 216 ft ~1 min
1000 South Fair Oaks Avenue, Pasadena 91105
Mo-We 10:30-01:00; Th-Sa 10:30-02:00; Su 09:00-24:00
Transit 319 ft ~2 min
Transit 490 ft ~2 min
Parking 696 ft ~3 min
Parking 845 ft ~4 min
Parking 899 ft ~4 min
Transit 1,022 ft ~4 min
EV charging Tesla Supercharger 0.20 mi ~5 min
Convenience 76 0.21 mi ~5 min
Gas station 76 0.21 mi ~5 min
Restaurant IHOP 0.21 mi ~5 min
880 South Arroyo Parkway, Pasadena 91105-3212
24/7
Restaurant Sidecar Doughnuts & Coffee 0.26 mi ~6 min
812 South Arroyo Parkway, Pasadena 91106
Mo-Th,Su 06:30-19:00; Fr-Sa 06:30-21:00
Coffee Starbucks 0.29 mi ~6 min
753 South Arroyo Parkway, Pasadena 91105
05:00-21:00
Coffee Rose Tree Cottage 0.31 mi ~7 min
Coffee Jones Coffee Roasters 0.33 mi ~7 min
693 South Raymond Avenue, Pasadena 91105
Mo-Su 07:00-17:00
Pharmacy CVS Pharmacy 0.33 mi ~7 min
Grocery Trader Joe's 0.46 mi ~10 min
610 South Arroyo Parkway, Pasadena 91105
08:00-21:00
Convenience Chevron 0.48 mi ~10 min
160 East California Boulevard, Pasadena 91105
24/7
Gas station Chevron 0.48 mi ~10 min
160 East California Boulevard, Pasadena 91105
24/7
Pharmacy Cal Oaks Pharmacy 0.48 mi ~10 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| PSY20926 | CA | Psychologist primary |
This provider holds licence PSY20926 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Psychologist covers
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public. NUCC Health Care Provider Taxonomy, code 103T00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003045527 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 6, 2009 |
| Last updated | Feb 21, 2014 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | PH.D. |
| Practice address |
988 S FAIR OAKS AVE Pasadena, CA 91105 (626) 582-7980 |
| Mailing address |
PO BOX 411014 Los Angeles, CA 90041 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 0 | 4 | 5 | 5 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 4 | 1 | 5 | 4 |
Sum = 43 · next multiple of 10 = 50 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.