DR. HIRAM ALBERTO GAY MD
NPI 1720045297
Radiology - Radiation Oncology in Saint Louis, MO

Q: What is Hiram Gay's NPI number?

The NPI number for Hiram Gay is 1720045297. It was assigned to this individual provider in the NPPES registry on April 28, 2006.

Q: What is Hiram Gay's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Q: When was this NPI record last updated?

The NPPES record for Hiram Gay was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.

Active since April 28, 2006PECOS EnrolledAccepts Medicare Assignment

92.39/100

CMS Quality Rating

4921 PARKVIEW PL, DEPT RADIATION ONCOLOGY, LL, SAINT LOUIS, MO 63110(314) 747-7236(314) 362-8099 Get Directions Write a Review

NPPES record last updated: April 17, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 18, 2024, Apr 25, 2024, Apr 10, 2024 and 2 more (5 updates tracked since 2021).

On this page

About Dr. Hiram Alberto Gay Md NPPES

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

DR. HIRAM ALBERTO GAY MD (NPI 1720045297) is an individual radiation oncology provider in Saint Louis, Missouri, licensed in Missouri (2009005440) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Alton Memorial Hospital, and is a graduate of University Of Puerto Rico School Of Medicine (2000).

NPPES Registry Identity

NPI1720045297

Entity TypeIndividualMale

Primary Taxonomy2085R0001X

Provider Legal NameDR. HIRAM ALBERTO GAYCredential: MD

Location Address4921 PARKVIEW PL, DEPT RADIATION ONCOLOGY, LLSaint Louis, MO 63110-1032

Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 747-7236 · Fax (314) 362-8099

Phone(314) 747-7236

Fax(314) 362-8099

Sole ProprietorNo

Medical School CMSUniversity Of Puerto Rico School Of MedicineGraduated 2000

Enumeration DateApril 28, 2006

Last NPPES UpdateApril 17, 20255 updates tracked since enumeration

✔ NPI 1720045297 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0001X

License✔ Licensed in MO · 2009005440

Definition

A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.

4921 PARKVIEW PL, Saint Louis, MO 63110

Open in Google Maps ↗

Other Identifiers 1

Medicaid206421703MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cox HealthPlans, UnitedHealthcare.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

Dr. Hiram Alberto Gay 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 ID5395771216

PECOS Enrollment IDI20090827000189, I20140425001099

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

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

Washington University Physicians In Illinois, Inc

0.1 mi

Multi-Specialty

4901 FOREST PARK AVE STE 341
Saint Louis, MO 63108

Reassigned Medicare billing, Illinois enrollment
530 clinicians in this Medicare group

NPI 1457203135 (314) 454-8181

Washington University

0.3 mi

Multi-Specialty

660 S EUCLID AVE
Saint Louis, MO 63110

Reassigned Medicare billing, Missouri enrollment
45 clinicians in this Medicare group

NPI 1316987886 (314) 362-8542

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 27

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.

Ct guidance for insertion of radiation therapy fields 77014

CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.

388 services48 patients

Ct guidance for insertion of radiation therapy fields 77014

328 services27 patients

Calculation of radiation therapy dose 77300

Radiation therapy dose calculation is a process to determine the exact amount of radiation needed to treat a specific area in the body. This calculation helps ensure the treatment is effective while minimizing harm to healthy tissues. It's a key part of planning your radiation therapy.

134 services33 patients

Calculation of radiation therapy dose 77300

119 services29 patients

Radiation treatment management, 5 treatment sessions 77427

Radiation treatment management involves a series of 5 sessions where targeted radiation is used to destroy or shrink cancer cells in your body. Each session is carefully planned to maximize effectiveness while minimizing harm to healthy tissues. You may experience side effects which will be closely monitored and managed for your comfort.

94 services24 patients

Design and construction of complex radiation treatment device 77334

The design and construction of a complex radiation treatment device is a process where a specialized instrument is created. This device targets harmful cells with high-energy rays to destroy or damage them, while minimizing impact on healthy cells. This aids in treating conditions like cancer.

67 services45 patients

Radiation treatment management, 5 treatment sessions 77427

56 services19 patients

Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy G6002

Stereoscopic x-ray guidance is a technique used in radiation therapy. It involves taking multiple X-ray images from different angles to create a 3D picture of the area to be treated. This helps accurately pinpoint the exact location for radiation delivery, ensuring the therapy is as effective as possible.

49 services13 patients

Placement of device in prostate for radiation therapy 55876

This procedure involves placing a small device in the gland below the bladder to deliver radiation therapy. This helps target therapy directly to the concerned area, potentially reducing side effects and improving treatment effectiveness.

46 services46 patients

Complex radiation therapy planning 77263

Complex radiation therapy planning is a process to determine the most effective way to deliver radiation to a specific area in your body. It involves detailed imaging to map your body's structure, allowing for precise targeting of cancer cells while sparing healthy tissue.

43 services43 patients

Ultrasonic guidance for needle placement 76942

Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.

41 services41 patients

Design and construction of complex radiation treatment device 77334

32 services15 patients

High precision radiation therapy planning 77301

High precision radiation therapy planning involves detailed mapping of your body to target cancer cells accurately. Advanced imaging techniques help identify the exact location of the tumor, minimizing harm to healthy tissues. This personalized approach enhances effectiveness and reduces side effects.

30 services29 patients

Design and construction of radiation treatment device for high precision radiation therapy 77338

A radiation treatment device is custom-made for each patient to target cancer cells with high precision. It's designed to focus radiation on the tumor, sparing healthy tissue. This process ensures effective therapy while minimizing side effects.

29 services28 patients

Complex radiation therapy planning 77263

28 services28 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

28 services28 patients

Injection of biodegradable material next to prostate 55874

This procedure involves the introduction of a biodegradable substance near a gland located in the lower abdomen. This substance helps to create a barrier between the gland and nearby tissues, aiding in the precise delivery of treatment to the intended area.

23 services23 patients

Design and construction of radiation treatment device for high precision radiation therapy 77338

23 services22 patients

High precision radiation therapy planning 77301

22 services22 patients

3d radiation therapy planning 77295

3D radiation therapy planning is a procedure that uses computer imaging to map out the area needing treatment. This ensures the radiation targets the disease precisely, while minimizing exposure to surrounding healthy tissues. It's a key step in preparing for effective radiation therapy.

18 services13 patients

Radioactive drug therapy through a vein 79101

Radioactive drug therapy through a vein involves injecting a drug with radioactive properties into your bloodstream. This drug travels throughout your body, targeting and destroying harmful cells, such as cancer cells, while sparing healthy ones. It's a non-invasive procedure to treat certain diseases.

18 services15 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

15 services13 patients

Management of cranial lesion surgery using radiation over multiple sessions 77435

This procedure involves using targeted radiation to treat a lesion in the brain over several sessions. The radiation destroys the abnormal cells, helping to control or eliminate the lesion. It's a non-invasive treatment, meaning no surgical cuts are made.

14 services14 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

14 services14 patients

Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved 77290

This procedure involves collecting necessary data to plan the best radiation treatment. It may cover 3 or more areas or any area requiring special attention. Data collection includes imaging scans and tests to understand the disease's extent and to tailor a precise, effective treatment plan.

13 services13 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

12 services12 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

11 services11 patients

Hospital Affiliations CMS Care Compare 5

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

Alton Memorial Hospital

Acute Care Hospitals · Alton, IL

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140002

LocationOne Memorial DriveAlton, IL 62002 · Madison County

Emergency services Birthing friendly

Memorial Hospital

Acute Care Hospitals · Belleville, IL

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140185

Location4500 Memorial DriveBelleville, IL 62226 · St. Clair County

Emergency services Birthing friendly

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO

4/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number260032

LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County

Emergency services Birthing friendly

Barnes-Jewish West County Hospital

Acute Care Hospitals · Creve Coeur, MO

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260162

Location12634 Olive BoulevardCreve Coeur, MO 63141 · St. Louis County

Emergency services

Christian Hospital Northeast

Acute Care Hospitals · Saint Louis, MO

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number260180

Location11133 Dunn RoadSaint Louis, MO 63136 · St. Louis County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63110 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

$169.38 typical visit price

range $55.65 – $169.38

Typical copayment $42.34 (range $13.91 – $42.34)

Most-billed visit code 99205

Established Patient

$69.50 typical visit price

range $17.76 – $137.92

Typical copayment $17.37 (range $4.44 – $34.48)

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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

92.39/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

97.81

Promoting Interoperability

100

Improvement Activities

Cost

70.26

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.

DR. CHARLES PHILLIPS JONES MD

Urology

4921 PARKVIEW PL, DIV SURG UROLOGY, STE 11C
SAINT LOUIS, MO 63110

St. Louis City (314) 362-8200

DR. PRABHA RANGANATHAN MD

Internal Medicine (Rheumatology)

4921 PARKVIEW PL, DIV IM RHEUMATOLOGY, STE 5C
SAINT LOUIS, MO 63110

St. Louis City (314) 286-2635

DR. RALPH GERARD DACEY JR. MD

Neurological Surgery

4921 PARKVIEW PL, DEPT NEUROLOGICAL SURGERY, STE 6B/6C
SAINT LOUIS, MO 63110

St. Louis City (314) 362-3577

DR. KRASIMIRA MIKHAILOVA MIKHOVA MD

Internal Medicine (Clinical Cardiac Electrophysiology)

4921 PARKVIEW PL, DIV IM CARDIOLOGY, STE 8B
SAINT LOUIS, MO 63110

St. Louis City (314) 362-1291

DR. JEE YOUNG HAN MD

Psychiatry & Neurology (Neurology)

4921 PARKVIEW PL, DIV NEUROLOGY AGING AND DEMENTIA, STE 6C
SAINT LOUIS, MO 63110

St. Louis City (314) 362-1408

MS. MAREN JORGENSEN OT

Occupational Therapist

4921 PARKVIEW PL, DEPT OCCUPATIONAL THERAPY, STE 6F
SAINT LOUIS, MO 63110

St. Louis City (314) 286-1669

DR. ADRIAN SHIFREN MD

Internal Medicine (Pulmonary Disease)

4921 PARKVIEW PL, DIV IM PULMONARY AND CCM, 8TH FL
SAINT LOUIS, MO 63110

St. Louis City (314) 454-8917

DR. MYRA L RUBIO MD

Internal Medicine

4921 PARKVIEW PL, STE 5A
SAINT LOUIS, MO 63110

St. Louis City (314) 747-5900

DR. PETER G TUTEUR MD

Internal Medicine (Pulmonary Disease)

4921 PARKVIEW PL, 8TH FLOOR
SAINT LOUIS, MO 63110

St. Louis City (314) 454-8917

DR. RAMASWAMY GOVINDAN MD

Internal Medicine (Medical Oncology)

4921 PARKVIEW PL, DIV IM MEDICAL ONCOLOGY, STE 7A, 7B, 7C
SAINT LOUIS, MO 63110

St. Louis City (800) 647-2098

DR. CAROLYN KAY MCCOURT MD

Obstetrics & Gynecology (Gynecologic Oncology)

4921 PARKVIEW PL, DIV OBGYN GYNECOLOGIC ONCOLOGY, STE 13C
SAINT LOUIS, MO 63110

St. Louis City (314) 362-3181

DR. ADEL BASSAM TABCHY MD

Internal Medicine (Medical Oncology)

4921 PARKVIEW PL, 7TH FLOOR
SAINT LOUIS, MO 63110

St. Louis City (314) 747-1171

DR. BRIAN ADAMS KELLY MD

Orthopaedic Surgery (Pediatric Orthopaedic Surgery)

4921 PARKVIEW PL, DEPT ORTHOPAEDIC SURGERY, STE 6A/6B/12A
SAINT LOUIS, MO 63110

St. Louis City (314) 514-3500

DR. NICHOLAS ANDREW PALLOTTA MD

Orthopaedic Surgery (Orthopaedic Surgery of the Spine)

4921 PARKVIEW PL, DEPT ORTHOPAEDIC SURGERY, STE 6A/6B/12A
SAINT LOUIS, MO 63110

St. Louis City (314) 514-3500

MS. LORNA C KAHN PT

Physical Therapist

4921 PARKVIEW PL, DEPT PHYSICAL THERAPY, STE 6F
SAINT LOUIS, MO 63110

St. Louis City (314) 286-1940

MS. BRENDA G GOTTER AUD

Audiologist

4921 PARKVIEW PL, DEPT OTOLARYNGOLOGY, STE 11A
SAINT LOUIS, MO 63110

St. Louis City (314) 362-7509

DR. KAN LIU MD

Internal Medicine (Cardiovascular Disease)

4921 PARKVIEW PL, DIV IM CARDIOLOGY, STE 8B
SAINT LOUIS, MO 63110

St. Louis City (314) 362-1291

DR. SINA A JASIM MD

Internal Medicine (Endocrinology, Diabetes & Metabolism)

4921 PARKVIEW PL, DIV IM ENDOCRINOLOGY, STE 5C
SAINT LOUIS, MO 63110

St. Louis City (314) 362-3500

MS. SUSAN ANNETTE WILLIAMS PA

Physician Assistant (Medical)

4921 PARKVIEW PL, DIV NEUROLOGY EPILEPSY, STE 6C
SAINT LOUIS, MO 63110

St. Louis City (314) 362-7845

MR. STEPHEN MATTHEW BROADDUS PA

Physician Assistant

4921 PARKVIEW PL, DEPT ORTHOPAEDIC SURGERY, STE 6A/6B/12A
SAINT LOUIS, MO 63110

St. Louis City (314) 514-3500

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 Hiram Gay's NPI number?

The NPI number for Hiram Gay is 1720045297. It was assigned to this individual provider in the NPPES registry on April 28, 2006.

Where is Hiram Gay located?

Hiram Gay practices at 4921 Parkview Pl Dept Radiation Oncology, Ll, Saint Louis, MO 63110. The listed phone number is (314) 747-7236.

What is Hiram Gay's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Is Hiram Gay enrolled in Medicare?

Yes. Hiram Gay 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 Hiram Gay's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hiram Gay reassigns Medicare benefits to 2 organizations: Washington University Physicians In Illinois, Inc (Saint Louis, MO) and Washington University (Saint Louis, MO). 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 Hiram Gay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Hiram Gay accept?

Health plans from Cox HealthPlans and UnitedHealthcare list Hiram Gay 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 Hiram Gay affiliated with any hospitals?

According to CMS data, Hiram Gay is affiliated with Alton Memorial Hospital, Memorial Hospital, Barnes Jewish Hospital, Barnes-Jewish West County Hospital and Christian Hospital Northeast.

When was this NPI record last updated?

The NPPES record for Hiram Gay was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.