1. Home
  2. Directory
  3. Colorado
  4. Castle Rock
  5. Obstetrics Gynecology
  6. NPI Profile

DR. KASSANDRA KAY MCMILLEN M.D,
NPI 1659746477
Obstetrics & Gynecology in Castle Rock, CO

Active since December 04, 2015PECOS EnrolledAccepts Medicare Assignment
2350 MEADOWS BLVD, CASTLE ROCK, CO 80109(720) 455-0350(720) 455-0351 Get Directions Write a Review

NPPES record last updated: February 26, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Feb 26, 2025, Apr 21, 2022, Nov 23, 2020 and 2 more (5 updates tracked since 2015).

About Dr. Kassandra Kay Mcmillen M.d, NPPES

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

DR. KASSANDRA KAY MCMILLEN M.D, (NPI 1659746477) is an individual obstetrics & gynecology provider in Castle Rock, Colorado, licensed in Colorado (DR0060302) and active in the NPI registry since December 2015. She is enrolled in Medicare PECOS, maintains a secondary practice location in Denver, and is a graduate of University Of Arkansas College Of Medicine (2014).

NPPES Registry Identity

NPI1659746477
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameDR. KASSANDRA KAY MCMILLENCredential: M.D,
Location Address2350 MEADOWS BLVDCastle Rock, CO 80109-8405
Mailing Address2350 Meadows BlvdCastle Rock, CO 80109-8405 · (720) 455-0350 · Fax (720) 455-0351
Phone(720) 455-0350
Fax(720) 455-0351
Sole ProprietorNo
Medical School CMSUniversity Of Arkansas College Of MedicineGraduated 2014
Enumeration DateDecember 4, 2015
Last NPPES UpdateFebruary 26, 20255 updates tracked since enumeration
NPPES CertifiedFebruary 26, 2025
✔ NPI 1659746477 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in CO · DR0060302
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
2350 MEADOWS BLVD, Castle Rock, CO 80109
Open in Google Maps ↗

Other Names 1

Former Name (1)Kassandra Thomas

Secondary Practice Location 1

Location 110350 E Dakota AveDenver, CO 80247-1314 · Phone (303) 338-4545

Other Identifiers 2

Other029358CO · Kaiser Commercial Number
Medicaid9000167241CO

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Kassandra Kay Mcmillen 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 ID345596698
PECOS Enrollment IDI20180629000341
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 80109 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
$132.55 typical visit price
range $58.06 – $174.82
Typical copayment $33.13 (range $14.51 – $43.70)
Most-billed visit code 99204
Established Patient
$72.20 typical visit price
range $18.88 – $142.79
Typical copayment $18.05 (range $4.72 – $35.69)
Most-billed visit code 99213
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.

USACS OF COLORADO INC
Emergency Medicine
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (330) 493-4443
KATHERINE GASSER
Registered Nurse
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 455-5000
SHERIDAN CHILDRENS HEALTHCARE SERVICES OF COLORADO PC
Pediatrics (Neonatal-Perinatal Medicine)
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 455-5000
STUART VIRGIL WEATHERWAX MD
Obstetrics & Gynecology
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 455-0350
PORTERCARE ADVENTIST HEALTH SYSTEM
Hospitalist
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 455-0650
HEALTHONE CLINIC SERVICES - PEDIATRIC SPECIALTIES LLC
Pediatrics (Pediatric Cardiology)
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 475-8730
HUGH E HALLMARK MD
Hospitalist
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 455-3879
HEALTHONE CLINIC SERVICES - SURGERY NEUROLOGICAL LLC
Neurological Surgery
2350 MEADOWS BLVD
CASTLE ROCK, CO 80109
Douglas County (720) 455-5000

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 Kassandra Mcmillen's NPI number?

The NPI number for Kassandra Mcmillen is 1659746477. It was assigned to this individual provider in the NPPES registry on December 4, 2015. The provider is also known as Kassandra Thomas.

Where is Kassandra Mcmillen located?

Kassandra Mcmillen practices at 2350 Meadows Blvd, Castle Rock, CO 80109. The listed phone number is (720) 455-0350.

What is Kassandra Mcmillen's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Kassandra Mcmillen enrolled in Medicare?

Yes. Kassandra Mcmillen 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.

When was this NPI record last updated?

The NPPES record for Kassandra Mcmillen was last updated on February 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months 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.