ALEXANDER MICHAEL MASON MD
NPI 1275758039
Neurological Surgery in Saint Paul, MN

Active since April 16, 2007PECOS EnrolledAccepts Medicare Assignment
640 JACKSON ST, SAINT PAUL, MN 55101(651) 495-6600(651) 254-3123 Get Directions Write a Review

NPPES record last updated: January 19, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 19, 2026, Dec 13, 2022 (2 updates tracked since 2022).

About Alexander Michael Mason Md NPPES

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

ALEXANDER MICHAEL MASON MD (NPI 1275758039) is an individual neurological surgery provider in Saint Paul, Minnesota, licensed in South Carolina (96060) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS, is affiliated with Trident Medical Center, and maintains a secondary practice location in Boulder.

NPPES Registry Identity

NPI1275758039
Entity TypeIndividualMale
Primary Taxonomy207T00000X
Provider Legal NameALEXANDER MICHAEL MASONCredential: MD
Location Address640 JACKSON STSaint Paul, MN 55101-2502
Mailing Address4743 Arapahoe Ve, Ste 202Boulder, CO 80303 · (303) 938-5700 · Fax (303) 998-0007
Fax(651) 254-3123
Sole ProprietorNo
Medical School CMSOhio State University College Of MedicineGraduated 2000
Enumeration DateApril 16, 2007
Last NPPES UpdateJanuary 19, 20262 updates tracked since enumeration
NPPES CertifiedJanuary 19, 2026
✔ NPI 1275758039 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNeurological SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207T00000X
Licenses✔ Licensed in SC · 96060✔ Licensed in MN · 59933✔ Licensed in CO · DR-46397✔ Licensed in OH · 57002649
Definition
A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.
640 JACKSON ST, Saint Paul, MN 55101

Secondary Practice Location 1

Location 14743 Arapahoe Ve, Ste 202Boulder, CO 80303 · Phone (303) 938-5700 · Fax (303) 998-0007

Accepted 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

Alexander Michael Mason Md 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 ID6901998582
PECOS Enrollment IDI20081007000492, I20260202000256
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

7

Medicare enrollment records show Alexander Mason reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Pediatric Dentistry
205 WABASHA ST S
Saint Paul, MN 55107
  • Reassigned Medicare billing, Minnesota enrollment
  • 2,274 clinicians in this Medicare group
Family Medicine
1000 NICOLLET MALL, TPS 260
Minneapolis, MN 55403
  • Reassigned Medicare billing, Minnesota enrollment
  • 2,527 clinicians in this Medicare group
Clinical
1606 PRAIRIE CENTER PKWY STE 210
Brighton, CO 80601
  • Reassigned Medicare billing, Colorado enrollment
  • 1,270 clinicians in this Medicare group
General Practice
777 BANNOCK ST
Denver, CO 80204
  • Reassigned Medicare billing, Colorado enrollment
  • 2,259 clinicians in this Medicare group
Internal Medicine
1365 CLIFTON RD NE
Atlanta, GA 30322
  • Reassigned Medicare billing, Georgia enrollment
  • 4,840 clinicians in this Medicare group
Internal Medicine
80 JESSE HILL JR DRIVE, EMCF
Atlanta, GA 30303
  • Reassigned Medicare billing, Georgia enrollment
  • 2,681 clinicians in this Medicare group
Surgery
9313 MEDICAL PLAZA DR STE 204
Charleston, SC 29406
  • Reassigned Medicare billing, South Carolina enrollment
  • 29 clinicians in this Medicare group

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

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Trident Medical Center

Acute Care Hospitals · Charleston, SC
3/5 CMS rating
OwnershipProprietary
CMS Certification Number420079
Location9330 Medical Plaza DrCharleston, SC 29406 · Charleston County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 55101 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
$127.61 typical visit price
range $56.00 – $168.28
Typical copayment $31.90 (range $14.00 – $42.07)
Most-billed visit code 99204
Established Patient
$69.74 typical visit price
range $18.32 – $138.04
Typical copayment $17.43 (range $4.58 – $34.51)
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.

Internal Medicine
640 JACKSON ST
SAINT PAUL, MN 55101
Internal Medicine
640 JACKSON ST
SAINT PAUL, MN 55101
Nurse Anesthetist, Certified Registered
640 JACKSON ST
SAINT PAUL, MN 55101
Internal Medicine
640 JACKSON ST
SAINT PAUL, MN 55101
Nurse Anesthetist, Certified Registered
640 JACKSON ST
SAINT PAUL, MN 55101
Orthopaedic Surgery
640 JACKSON ST
SAINT PAUL, MN 55101
Nurse Anesthetist, Certified Registered
640 JACKSON ST, MAIL STOP 11503P
ST PAUL, MN 55101
Pathology (Anatomic Pathology & Clinical Pathology)
640 JACKSON ST, MC 11103E
ST PAUL, MN 55101

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 Mason's NPI number?

The NPI number for Alexander Mason is 1275758039. It was assigned to this individual provider in the NPPES registry on April 16, 2007.

Where is Alexander Mason located?

Alexander Mason practices at 640 Jackson St, Saint Paul, MN 55101. The listed phone number is (651) 495-6600.

What is Alexander Mason's specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Is Alexander Mason enrolled in Medicare?

Yes. Alexander Mason 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 Alexander Mason's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Mason reassigns Medicare benefits to 7 organizations: Group Health, Inc. (Saint Paul, MN), Park Nicollet Clinic (Minneapolis, MN), Intermountain Medical Group Denver, LLC (Brighton, CO), Denver Health And Hospital Authority (Denver, CO), The Emory Clinic Inc (Atlanta, GA) and 2 more organizations, listed in the Medicare section above. 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 Alexander Mason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Alexander Mason accept?

Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of North Carolina, BlueCross BlueShield of South Carolina and First Choice Next and 1 other insurer list Alexander Mason 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.

Is Alexander Mason affiliated with any hospitals?

According to CMS data, Alexander Mason is affiliated with Trident Medical Center.

When was this NPI record last updated?

The NPPES record for Alexander Mason was last updated on January 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.