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MR. MARK M LESSNER M.D.
NPI 1497857999
Pediatrics in Parker, AZ

Active since September 04, 2006PECOS EnrolledAccepts Medicare Assignment
601 W RIVERSIDE DR STE 2, PARKER, AZ 85344(928) 256-4110(928) 722-6113 Get Directions Write a Review

NPPES record last updated: May 19, 2021. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: May 19, 2021, Jun 14, 2016 (2 updates tracked since 2016).

About Mr. Mark M Lessner M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MR. MARK M LESSNER M.D. (NPI 1497857999) is an individual pediatrics provider in Parker, Arizona, licensed in California (33868) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of University Of Arizona College Of Medicine (1975).

NPPES Registry Identity

NPI1497857999
Entity TypeIndividualMale
Primary Taxonomy208000000X
Provider Legal NameMR. MARK M LESSNERCredential: M.D.
Location Address601 W RIVERSIDE DR STE 2Parker, AZ 85344-5119
Mailing Address1079 Eucalyptus St, Suite#aManteca, CA 95337 · (209) 239-6008 · Fax (209) 239-3408
Phone(928) 256-4110
Fax(928) 722-6113
Sole ProprietorNo
Medical School CMSUniversity Of Arizona College Of MedicineGraduated 1975
Enumeration DateSeptember 4, 2006
Last NPPES UpdateMay 19, 20212 updates tracked since enumeration
NPPES CertifiedMay 19, 2021
✔ NPI 1497857999 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in CA · 33868
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
Also ListedFamily MedicineTaxonomy 207Q00000X · License G33868 (CA)
601 W RIVERSIDE DR STE 2, Parker, AZ 85344
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Secondary Practice Locations 2

Location 1601 W Riverside Dr Ste 4Parker, AZ 85344-5119 · Phone (928) 256-4110 · Fax (928) 722-6113
Location 2968-R Woodside RdRedwood City, CA 94061 · Phone (408) 356-1002 · Fax (209) 239-3408

Other Identifiers 1

Medicaid594551AZ

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health, Blue Cross Blue Shield of Arizona and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mr. Mark M Lessner M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2961485859
PECOS Enrollment IDI20040610001827, I20191114000192
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Mark Lessner reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

San Luis Walk-In Clinic, Inc.
Same address
Rural Health
601 W RIVERSIDE DR STE 2
Parker, AZ 85344
  • Reassigned Medicare billing, Arizona enrollment
  • 89 clinicians in this Medicare group
NPI 1316568595 (928) 256-4110
Walker Family Medicine Plc
289 mi
Family Medicine
801 W REX ALLEN DR
Willcox, AZ 85643
  • Reassigned Medicare billing, Arizona enrollment
  • 7 clinicians in this Medicare group
NPI 1194907758 (520) 766-5000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85344 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$85.89 typical visit price
range $55.44 – $168.60
Typical copayment $21.47 (range $13.86 – $42.15)
Most-billed visit code 99203
Established Patient
$98.00 typical visit price
range $17.72 – $137.41
Typical copayment $24.50 (range $4.43 – $34.35)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SAN LUIS WALK-IN CLINIC, INC.
Clinic/Center (Rural Health)
601 W RIVERSIDE DR STE 2
PARKER, AZ 85344
LA Paz County (928) 256-4110
NAVANEETH CHANDRU KUMAR MD
Family Medicine
601 W RIVERSIDE DR STE 2
PARKER, AZ 85344
LA Paz County (928) 256-4110
DR. KATHY KLADAR FNP-BC
Nurse Practitioner (Primary Care)
601 W RIVERSIDE DR STE 2
PARKER, AZ 85344
LA Paz County (928) 256-4110
SAN LUIS WALK-IN CLINIC, INC.
Clinic/Center (Rural Health)
601 W RIVERSIDE DR STE 2
PARKER, AZ 85344
LA Paz County (928) 256-4110

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Lessner's NPI number?

The NPI number for Mark Lessner is 1497857999. It was assigned to this individual provider in the NPPES registry on September 4, 2006.

Where is Mark Lessner located?

Mark Lessner practices at 601 W Riverside Dr Ste 2, Parker, AZ 85344. The listed phone number is (928) 256-4110.

What is Mark Lessner's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Mark Lessner enrolled in Medicare?

Yes. Mark Lessner is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Mark Lessner's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Lessner reassigns Medicare benefits to 2 organizations: San Luis Walk-In Clinic, Inc. (Parker, AZ) and Walker Family Medicine Plc (Willcox, AZ). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Lessner's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Lessner accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Blue Cross Blue Shield of Arizona and UnitedHealthcare list Mark Lessner as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mark Lessner was last updated on May 19, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.