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DR. TRISTAN PHILLIP FREILING D.O.
NPI 1215381264
Anesthesiology in Saint Louis, MO

Active since April 15, 2016PECOS EnrolledAccepts Medicare Assignment
615 S NEW BALLAS RD, SAINT LOUIS, MO 63141(636) 386-9224(636) 200-4243 Get Directions Write a Review

NPPES record last updated: June 11, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 11, 2021, May 10, 2016 (2 updates tracked since 2016).

About Dr. Tristan Phillip Freiling D.o. NPPES

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

DR. TRISTAN PHILLIP FREILING D.O. (NPI 1215381264) is an individual anesthesiology provider in Saint Louis, Missouri, licensed in Missouri (2021013176) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1215381264
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameDR. TRISTAN PHILLIP FREILINGCredential: D.O.
Location Address615 S NEW BALLAS RDSaint Louis, MO 63141-8221
Mailing Address339 Consort DrBallwin, MO 63011-4439 · (636) 386-9224 · Fax (636) 200-4243
Phone(636) 386-9224
Fax(636) 200-4243
Sole ProprietorNo
Medical School CMSAt Still University Of Health Sciences, College Of Osteo Med, KirksvilleGraduated 2016
Enumeration DateApril 15, 2016
Last NPPES UpdateJune 11, 20212 updates tracked since enumeration
NPPES CertifiedJune 11, 2021
✔ NPI 1215381264 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in MO · 2021013176
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
615 S NEW BALLAS RD, Saint Louis, MO 63141
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Secondary Practice Location 1

Location 15841 S Maryland Ave, MC 4028Chicago, IL 60637-1447 · Phone (773) 834-0063

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

Dr. Tristan Phillip Freiling D.o. 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 ID1557653185
PECOS Enrollment IDI20210729003424
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 Tristan Freiling reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Western Anesthesiology Associates, Inc.
1.5 mi
Anesthesiology
615 S NEW BALLAS RD, DEPT. OF ANESTHESIA
Saint Louis, MO 63141
  • Reassigned Medicare billing, Missouri enrollment
  • 309 clinicians in this Medicare group
NPI 1275646754 (636) 386-9224

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 10

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.

Anesthesia for other procedure on large bowel using an endoscope 00811
Anesthesia for an endoscopic procedure on the large bowel ensures comfort and relaxation during the procedure. You'll be given medication to make you drowsy or asleep, eliminating any discomfort. The medication can be administered through a vein or inhaled.
48 services48 patients
Insertion of artery tube for blood sampling or infusion through skin 36620
This procedure involves placing a small tube into an artery, usually in the wrist or elbow, to collect blood samples or administer medication. It's done under local anesthesia and is a common, safe practice.
36 services34 patients
Anesthesia for x-ray or radiation therapy 01922
Anesthesia for x-ray or radiation therapy involves administering medication to help you relax or sleep during the procedure. It's used to ensure comfort, minimize movement, and reduce anxiety. The type of anesthesia used depends on the procedure and patient's health.
35 services35 patients
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope 00731
This procedure involves the use of an endoscope, a flexible tube with a light and camera, to examine your esophagus, stomach, or upper small bowel. Anesthesia ensures you are comfortable and pain-free during the procedure.
23 services23 patients
Insertion of non-tunneled central venous tube for infusion (5 years or older) 36556
This procedure involves placing a thin tube into a large vein, usually in the neck or chest, to administer medication or fluids. It's done under local anesthesia to minimize discomfort. It's a standard, safe procedure for individuals aged 5 and above.
22 services16 patients
Anesthesia for procedure to correct abnormal heart rhythm 00410
Anesthesia for a procedure to correct abnormal heart rhythm ensures you won't feel pain during the treatment. It can be general, where you're completely asleep, or local, numbing only a specific area. Your vital signs are monitored to ensure safety during the procedure.
21 services21 patients

Hospital Affiliations CMS Care Compare

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

Mercy Hospital St Louis

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260020
Location615 New Ballas RoadSaint Louis, MO 63141 · St. Louis County
Emergency services Birthing friendly

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.

MRS. PATRICIA ANN RICE APN
Nurse Practitioner (Family)
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6339
MARY BETH WALKER FNP
Nurse Practitioner (Family)
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6000
LOVEPREET SINGH RANDHAWA MD
Internal Medicine
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6339
DR. CONNOR ROBERT REIS DO
Internal Medicine
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6930
MR. SHEBY THOMAS AA-S
Anesthesiologist Assistant
615 S NEW BALLAS RD, DEPT OF ANESTHESIOLOGY
SAINT LOUIS, MO 63141
St. Louis County (636) 386-9224
JOSE L OLIVER SEGARRA
Dentist
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6382
CAREN BIRKENKAMP PMHNP-BC
Nurse Practitioner (Psychiatric/Mental Health)
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 251-6000
ANAS M HASIC MD
Internal Medicine
615 S NEW BALLAS RD
SAINT LOUIS, MO 63141
St. Louis County (314) 509-5305

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 Tristan Freiling's NPI number?

The NPI number for Tristan Freiling is 1215381264. It was assigned to this individual provider in the NPPES registry on April 15, 2016.

Where is Tristan Freiling located?

Tristan Freiling practices at 615 S New Ballas Rd, Saint Louis, MO 63141. The listed phone number is (636) 386-9224.

What is Tristan Freiling's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Tristan Freiling enrolled in Medicare?

Yes. Tristan Freiling 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 organization bills Medicare for Tristan Freiling's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Tristan Freiling reassigns Medicare benefits to Western Anesthesiology Associates, Inc. (Saint Louis, MO). The 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 Tristan Freiling's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Tristan Freiling affiliated with any hospitals?

According to CMS data, Tristan Freiling is affiliated with Mercy Hospital St Louis.

When was this NPI record last updated?

The NPPES record for Tristan Freiling was last updated on June 11, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.