Mark Lessner, M.D.
NPI 1497857999 · Pediatrics Physician · Parker, AZ
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Lessner, M.D. is a Pediatrics Physician provider in Parker, AZ (NPI 1497857999).
Provider details
- NPI number
- 1497857999
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G33868 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 3 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Atorvastatin Calcium | 13 |
| Ezetimibe | 13 |
| Levothyroxine Sodium | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 601 W Riverside Dr Ste 4Parker, AZ 85344-5119Phone: (928) 256-4110Fax: (928) 722-6113
- 968-R Woodside RdRedwood City, CA 94061Phone: (408) 356-1002Fax: (209) 239-3408
Registry dates
- Enumerated
- 2006-09-04
- Last updated
- 2021-05-19
- Certified
- 2021-05-19
Frequently asked questions
- What is Mark Lessner's NPI number?
- Mark Lessner's National Provider Identifier (NPI) is 1497857999, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Lessner's specialty?
- Mark Lessner is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Lessner located?
- Mark Lessner's practice location on file with NPPES is 601 W Riverside Dr Ste 2, Parker, AZ 85344-5119.
- What is Mark Lessner's phone number?
- The practice phone number listed in the NPPES registry for Mark Lessner is (928) 256-4110.
- Does Mark Lessner accept Medicare?
- Mark Lessner is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Lessner's NPI active?
- Yes — Mark Lessner's NPI (1497857999) is active in the NPPES registry as of the last update on 2021-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.