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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. ALEXANDER GREGORY HAYDEN MD
NPI 1356970636
Internal Medicine - Hematology & Oncology in Lafayette, CO

Active since April 07, 2020PECOS Enrolled
280 EXEMPLA CIR, LAFAYETTE, CO 80026(303) 338-4545 Get Directions Write a Review

NPPES record last updated: September 2, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Sep 2, 2026, Apr 7, 2020 (2 updates tracked since 2020).

About Dr. Alexander Gregory Hayden Md NPPES

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

DR. ALEXANDER GREGORY HAYDEN MD (NPI 1356970636) is an individual hematology & oncology provider in Lafayette, Colorado, licensed in Colorado (DR.0071198) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS and maintains a secondary practice location in Aurora.

NPPES Registry Identity

NPI1356970636
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameDR. ALEXANDER GREGORY HAYDENCredential: MD
Location Address280 EXEMPLA CIRLafayette, CO 80026-3370
Mailing Address10350 E Dakota AveDenver, CO 80247-1314
Phone(303) 338-4545
Sole ProprietorNo
Enumeration DateApril 7, 2020
Last NPPES UpdateSeptember 2, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 2, 2026
✔ NPI 1356970636 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License✔ Licensed in CO · DR.0071198
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
280 EXEMPLA CIR, Lafayette, CO 80026
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Other Names 1

Other Name (5)Alex Hayden

Secondary Practice Location 1

Location 113001 E 17th PlAurora, CO 80045-2570 · Phone (303) 724-1784

Other Identifiers 1

Medicaid9000183562CO

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Alexander Gregory Hayden Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80026 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
$174.82 typical visit price
range $58.06 – $174.82
Typical copayment $43.70 (range $14.51 – $43.70)
Most-billed visit code 99205
Established Patient
$102.03 typical visit price
range $18.88 – $142.79
Typical copayment $25.50 (range $4.72 – $35.69)
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 20

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

BRANDI D SMALLEY
General Practice
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (303) 743-5855
KRISTY LYNN FAULKNER NP
Nurse Practitioner (Family)
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (303) 338-4545
MARIKA BRIMEYER RN
Registered Nurse
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (303) 614-1400
NANCY GARLAND
Social Worker (Clinical)
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (303) 345-8156
BARBARA D MULLEN
Surgery
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (720) 536-7050
DR. JULIE A MELCHIOR
Orthopaedic Surgery
280 EXEMPLA CIR, DEPARTMENT OF ORTHOPAEDICS
LAFAYETTE, CO 80026
Boulder County (303) 338-4545
M. LISA SCHWARTZ
Specialist/Technologist Cardiovascular (Cardiovascular Invasive Specialist)
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (720) 536-6517
SHARON K BALDIZAN
Nurse's Aide
280 EXEMPLA CIR
LAFAYETTE, CO 80026
Boulder County (720) 536-7462

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 Alexander Hayden's NPI number?

The NPI number for Alexander Hayden is 1356970636. It was assigned to this individual provider in the NPPES registry on April 7, 2020. The provider is also known as Alex Hayden.

Where is Alexander Hayden located?

Alexander Hayden practices at 280 Exempla Cir, Lafayette, CO 80026. The listed phone number is (303) 338-4545.

What is Alexander Hayden's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Alexander Hayden enrolled in Medicare?

Yes. Alexander Hayden is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Alexander Hayden was last updated on September 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 days 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.