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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.

ALLISON JOY NIELSEN MD, MS
NPI 1578404083
Obstetrics & Gynecology in Saginaw, MI

Active since April 01, 2026PECOS Enrolled
1000 HOUGHTON AVE, SAGINAW, MI 48602(989) 774-7547 Get Directions Write a Review

NPPES record last updated: August 27, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Aug 27, 2026, Apr 30, 2026, Apr 1, 2026 (3 updates tracked since 2026).

About Allison Joy Nielsen Md, Ms NPPES

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

ALLISON JOY NIELSEN MD, MS (NPI 1578404083) is an individual obstetrics & gynecology provider in Saginaw, Michigan, licensed in Michigan (4351056084) and active in the NPI registry since April 2026. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1578404083
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameALLISON JOY NIELSENCredential: MD, MS
Location Address1000 HOUGHTON AVESaginaw, MI 48602-5303
Mailing Address1000 Houghton AveSaginaw, MI 48602-5303 · (989) 746-7809
Phone(989) 774-7547
Sole ProprietorNo
Enumeration DateApril 1, 2026
Last NPPES UpdateAugust 27, 20263 updates tracked since enumeration
NPPES CertifiedAugust 27, 2026
✔ NPI 1578404083 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in MI · 4351056084
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.
1000 HOUGHTON AVE, Saginaw, MI 48602
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Other Names 1

Former Name (1)Allison Joy Christians

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Allison Joy Nielsen Md, Ms 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 48602 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
$126.15 typical visit price
range $54.34 – $166.68
Typical copayment $31.53 (range $13.58 – $41.67)
Most-billed visit code 99204
Established Patient
$68.07 typical visit price
range $17.09 – $135.40
Typical copayment $17.01 (range $4.27 – $33.85)
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.

JERRY XAVIER
Internal Medicine
1000 HOUGHTON AVE, 1100 INTERNAL MEDICINE
SAGINAW, MI 48602
Saginaw County (989) 583-5826
MRS. VERONIKA KINASCHUK M.D.
Obstetrics & Gynecology
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (989) 746-7500
DR. MEAGAN CROFOOT MD
Emergency Medicine
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (989) 583-6800
KATIE ANN LONDOS
Nurse Practitioner (Pediatrics)
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (989) 746-7500
PAVAN SHIVANI SINGH MD
Pediatrics
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (947) 362-4191
DR. OMAIMA ALI A AL SINAN M.D
Obstetrics & Gynecology
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (989) 583-6828
SHAFIA BEG M.D.
Internal Medicine
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (989) 583-6800
DR. JAMIE MARIE RITTER MD
Emergency Medicine
1000 HOUGHTON AVE
SAGINAW, MI 48602
Saginaw County (989) 746-7500

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 Allison Nielsen's NPI number?

The NPI number for Allison Nielsen is 1578404083. It was assigned to this individual provider in the NPPES registry on April 1, 2026. The provider is also known as Allison Joy Christians.

Where is Allison Nielsen located?

Allison Nielsen practices at 1000 Houghton Ave, Saginaw, MI 48602. The listed phone number is (989) 774-7547.

What is Allison Nielsen's specialty?

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

Is Allison Nielsen enrolled in Medicare?

Yes. Allison Nielsen is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Allison Nielsen was last updated on August 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.