WILLIAM BRIAN GREISER MD
NPI 1720114408
Emergency Medicine in Trinidad, CO

Q: What is William Greiser's NPI number?

The NPI number for William Greiser is 1720114408. It was assigned to this individual provider in the NPPES registry on February 26, 2007.

Q: What is William Greiser's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Q: When was this NPI record last updated?

The NPPES record for William Greiser was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.

Active since February 26, 2007PECOS Enrolled

410 BENEDICTA AVE, TRINIDAD, CO 81082(800) 893-9698 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About William Brian Greiser Md NPPES

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

WILLIAM BRIAN GREISER MD (NPI 1720114408) is an individual emergency medicine provider in Trinidad, Colorado, licensed in Colorado (36079) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1720114408

Entity TypeIndividualMale

Primary Taxonomy207P00000X

Provider Legal NameWILLIAM BRIAN GREISERCredential: MD

Location Address410 BENEDICTA AVETrinidad, CO 81082-2005

Mailing Address200 Corporate Blvd, Ste 201Lafayette, LA 70508-3870

Phone(800) 893-9698

Sole ProprietorNo

Enumeration DateFebruary 26, 2007

Last NPPES UpdateJuly 8, 2007

✔ NPI 1720114408 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

License✔ Licensed in CO · 36079

Definition

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

410 BENEDICTA AVE, Trinidad, CO 81082

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Other Identifiers 1

Medicare UPINC70734

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Brian Greiser 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.

Medicare Billing Reassignment

Medicare enrollment records show William Greiser reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southeastern Emergency Physicians LLC

1,132 mi

Emergency Medicine

989 MEDICAL PARK DR
Maysville, KY 41056

Reassigned Medicare billing, Kentucky enrollment
828 clinicians in this Medicare group

NPI 1356379382 (606) 759-5311

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

Areas of Expertise CMS Part B claims 3

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

17 services17 patients

Emergency department visit with moderate level of medical decision making 99284

An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.

16 services16 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 81082 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

$89.43 typical visit price

range $58.06 – $174.82

Typical copayment $22.35 (range $14.51 – $43.70)

Most-billed visit code 99203

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 18

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

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