Armen Isaiants, M.D.
NPI 1659336964 · Internal Medicine Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Armen Isaiants, M.D. is a Internal Medicine Physician provider in Pasadena, CA (NPI 1659336964).
Provider details
- NPI number
- 1659336964
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A061592 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
158 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 72 | $99 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 27 | $21 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 25 | $140 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 19 | $62 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 15 | $138 |
Typical Medicare-allowed amounts for these services range $21–$140 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 92 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 622 | 179 |
| Amlodipine Besylate | 283 | 81 |
| Lisinopril | 188 | 54 |
| Omeprazole | 132 | 37 |
| Carvedilol | 129 | 40 |
| Metformin Hcl | 123 | 41 |
| Chlorthalidone | 112 | 30 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-19
- Last updated
- 2012-11-05
Frequently asked questions
- What is Armen Isaiants's NPI number?
- Armen Isaiants's National Provider Identifier (NPI) is 1659336964, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Armen Isaiants's specialty?
- Armen Isaiants is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Armen Isaiants located?
- Armen Isaiants's practice location on file with NPPES is 988 S Fair Oaks Ave, Pasadena, CA 91105-2626.
- What is Armen Isaiants's phone number?
- The practice phone number listed in the NPPES registry for Armen Isaiants is (626) 799-4192.
- Does Armen Isaiants accept Medicare?
- Armen Isaiants is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Armen Isaiants's NPI active?
- Yes — Armen Isaiants's NPI (1659336964) is active in the NPPES registry as of the last update on 2012-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.