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DR. ISABEL QUINTANA GREENFIELD M.D.
NPI 1326432873
Obstetrics & Gynecology in Missoula, MT

Active since March 23, 2015PECOS Enrolled
401 RAILROAD ST W, MISSOULA, MT 59802(406) 258-4494 Get Directions Write a Review

NPPES record last updated: February 13, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 13, 2025, Dec 17, 2021 (2 updates tracked since 2021).

About Dr. Isabel Quintana Greenfield M.d. NPPES

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

DR. ISABEL QUINTANA GREENFIELD M.D. (NPI 1326432873) is an individual obstetrics & gynecology provider in Missoula, Montana, licensed in Montana (MED-PHYS-APP-142558) and active in the NPI registry since March 2015. She is enrolled in Medicare PECOS and maintains a secondary practice location in San Francisco.

NPPES Registry Identity

NPI1326432873
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameDR. ISABEL QUINTANA GREENFIELDCredential: M.D.
Location Address401 RAILROAD ST WMissoula, MT 59802-4178
Mailing Address401 Railroad St WMissoula, MT 59802-4178
Phone(406) 258-4494
Sole ProprietorNo
Enumeration DateMarch 23, 2015
Last NPPES UpdateFebruary 13, 20252 updates tracked since enumeration
NPPES CertifiedFebruary 13, 2025
✔ NPI 1326432873 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
Licenses✔ Licensed in MT · MED-PHYS-APP-142558✔ Licensed in CA · A144104
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.
401 RAILROAD ST W, Missoula, MT 59802
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Secondary Practice Location 1

Location 12425 Geary Blvd, M160San Francisco, CA 94115-3358 · Phone (415) 833-9183

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Mountain Health CO-OP, PacificSource Health Plans, Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Isabel Quintana Greenfield M.d. 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.

Medicare Billing Reassignments

2

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

Partnership Health Center Inc
Same address
Family Medicine
401 RAILROAD ST W
Missoula, MT 59802
  • Reassigned Medicare billing, Montana enrollment
  • 91 clinicians in this Medicare group
NPI 1326336454 (406) 258-4496
Permanente Medical Group Inc
716 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000

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 59802 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
$130.52 typical visit price
range $56.81 – $172.26
Typical copayment $32.63 (range $14.20 – $43.06)
Most-billed visit code 99204
Established Patient
$70.82 typical visit price
range $18.24 – $140.32
Typical copayment $17.70 (range $4.56 – $35.08)
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.

MARK CHRISTOPHER WAYNE LCSW
Social Worker (Clinical)
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 830-5584
MS. KAITLYN NINA BOSSHARDT LMSW
Social Worker (Clinical)
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789
ELLEN JEAN BLUETT PHD
Psychologist (Clinical)
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789
NED F VASQUEZ MD
Family Medicine
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789
RYAN HINSHAW RN
Registered Nurse
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789
ANN MAUREEN O'CONNOR PA C
Physician Assistant (Medical)
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789
ARIEL FILLMORE MD
Family Medicine
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789
JESTINE TERYSSA MACDONALD MD
Family Medicine
401 RAILROAD ST W
MISSOULA, MT 59802
Missoula County (406) 258-4789

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 Isabel Greenfield's NPI number?

The NPI number for Isabel Greenfield is 1326432873. It was assigned to this individual provider in the NPPES registry on March 23, 2015.

Where is Isabel Greenfield located?

Isabel Greenfield practices at 401 Railroad St W, Missoula, MT 59802. The listed phone number is (406) 258-4494.

What is Isabel Greenfield's specialty?

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

Is Isabel Greenfield enrolled in Medicare?

Yes. Isabel Greenfield is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Isabel Greenfield's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Isabel Greenfield reassigns Medicare benefits to 2 organizations: Partnership Health Center Inc (Missoula, MT) and Permanente Medical Group Inc (Stockton, CA). 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 Isabel Greenfield's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Isabel Greenfield accept?

Health plans from Mountain Health CO-OP, PacificSource Health Plans and Providence Health Plan list Isabel Greenfield 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 Isabel Greenfield was last updated on February 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.