Active NPI 1194334094 Individual Practitioner Female Practitioner

Olivia Faeth Hasselfeld , PA

Physician Assistant • O Fallon, MO

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Olivia Hasselfeld, PA is a certified Physician Assistant practicing in O Fallon, MO. With approximately 6 years of clinical experience since completing medical education in 2020, Olivia Hasselfeld delivers high-quality medical care to the local community at 2 PROGRESS POINT PKWY.

Olivia Hasselfeld is affiliated with Washington University and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, initial hospital care with straightforward or low-level medical decision making, if using time, at least, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

2 Progress Point Pkwy
Div Im Medical Oncology

O Fallon, MO 633682205

Telephone 8006472098

Fax 3143623192

Associated Practice Facility / Clinic

🏢 Progress West Healthcare Center Facility NPI 1881202927

Medicare Profile & Education

Medical School

Other

Graduation Year

2020

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Physician Assistant in O Fallon, MO

Experienced Practitioner (5-10 Yrs)

Practitioner Clinical Experience

6 Yrs -3.6 yrs vs City Avg

City Avg: 9.6 Yrs

State Avg: 10.3 Yrs

Regional Practice Density

19 Specialists

Practicing in O Fallon, MO (1802 Statewide)

Telehealth Adoption Rate

15.8% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

76.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Hasselfeld (6 Years) 6 Yrs

O Fallon Specialty Average (9.6 Years) 9.6 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	104	55	$227.58	$62.47
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	41	40	$481.61	$103.60

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	107	51	$209.66	$65.49
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	36	33	$447.00	$107.73
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	14	12	$617.00	$143.61

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J1100 Injection, dexamethasone sodium phosphate, 1 mg	182	30	$10.00	$0.12
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	124	123	$318.00	$106.29
87635 Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen	88	87	$175.00	$50.11
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	41	40	$73.71	$12.07
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	36	36	$490.50	$138.31
87502 Detection test by nucleic acid for multiple types influenza virus	30	30	$270.00	$94.65
J1885 Injection, ketorolac tromethamine, per 15 mg	29	16	$10.00	$0.53
71046 X-ray of chest, 2 views	24	24	$213.18	$27.44
81002 Urinalysis, manual test	23	23	$30.00	$3.44
99213 Established patient office or other outpatient visit, typically 15 minutes	21	21	$182.06	$76.14
82565 Blood creatinine level	20	18	$10.19	$5.04
80051 Blood test panel for electrolytes (sodium potassium, chloride, carbon dioxide)	19	17	$14.02	$6.89
82550 Creatine kinase (cardiac enzyme) level, total	19	17	$13.02	$6.40
J7030 Infusion, normal saline solution , 1000 cc	17	17	$10.00	$2.64
84520 Urea nitrogen level to assess kidney function	16	16	$10.67	$3.88
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	15	15	$117.84	$47.45
82947 Blood glucose (sugar) level	13	11	$7.86	$3.86
85018 Blood count, hemoglobin	11	11	$20.08	$2.33
93000 Routine ekg using at least 12 leads including interpretation and report	11	11	$123.00	$12.02

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
Q9967 Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml	1,530	14	$1.50	$0.12
J1100 Injection, dexamethasone sodium phosphate, 1 mg	152	31	$10.00	$0.15
87635 Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen	57	57	$148.68	$51.31
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	53	53	$318.00	$108.25
87811 Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19)	52	52	$159.13	$41.38
99213 Established patient office or other outpatient visit, typically 15 minutes	42	42	$182.06	$76.61
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	36	34	$73.71	$11.94
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	36	36	$490.50	$142.23
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	34	34	$111.90	$47.56
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	31	31	$320.82	$95.12
J1885 Injection, ketorolac tromethamine, per 15 mg	31	17	$10.00	$0.42
85018 Blood count, hemoglobin	30	30	$54.97	$2.29
85014 Red blood cell concentration measurement	30	30	$56.45	$2.29
81002 Urinalysis, manual test	30	30	$30.00	$3.36
80047 Blood test, basic group of blood chemicals (calcium, ionized)	30	30	$66.11	$13.27
J7030 Infusion, normal saline solution , 1000 cc	27	23	$10.00	$2.39
99202 New patient office or other outpatient visit, typically 20 minutes	25	25	$146.26	$61.80
71046 X-ray of chest, 2 views	24	24	$213.18	$28.48
84075 Phosphatase (enzyme) level, alkaline	12	12	$10.01	$5.18
82247 Bilirubin level	12	12	$9.71	$5.02
84460 Liver enzyme (sgpt), level	12	12	$10.23	$5.30
82040 Albumin (protein) level	12	12	$9.58	$4.95
82150 Amylase (enzyme) level	12	12	$32.14	$6.48
84450 Liver enzyme (sgot), level	12	12	$9.39	$5.18
84155 Total protein level, blood	12	12	$6.74	$3.67

Medical Specialties & State Licenses

CMS Verified: 2023-12-19

Physician Assistant Primary Specialty

NUCC Taxonomy Code: 363A00000X

State License MO 2020026369

A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

220117552 (MO)

Hospital & Practice Group Affiliations

Washington University

10 Hospital Dr, Saint Peters, MO 633761659

Phone: 8006472098

Washington University

11133 Dunn Rd, Saint Louis, MO 631366163

Phone: 3143627603

Washington University

10 Hospital Dr Mob, St Peters, MO 633761659

Phone: 8006472098

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

40 Associated Practitioners

Dr. Charles Kaufman , MD

Internal Medicine - Medical Oncology

NPI 1003953613

Doctor of Medicine (M.D.)

Dr. Ramaswamy Govindan , MD

Internal Medicine - Medical Oncology

NPI 1023034261

Doctor of Medicine (M.D.)

Dr. Adel Tabchy , MD

Internal Medicine - Medical Oncology

NPI 1023206158

Doctor of Medicine (M.D.)

Dr. Haobin Chen , MD

Internal Medicine - Medical Oncology

NPI 1023456712

Doctor of Medicine (M.D.)

Amy Ngo , FNP

Nurse Practitioner

NPI 1023580099

Family Nurse Practitioner

Dr. Mia Weiss , MD

Internal Medicine - Medical Oncology

NPI 1033525332

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

18 Historical Events

📍

Updated Business Mailing Address April 17, 2025

Registered at PO BOX 7412011, CHICAGO, IL 606742011 (Tel: 8006472098)

📍

Updated Practice Location April 25, 2024

Registered at 2 PROGRESS POINT PKWY, DIV IM MEDICAL ONCOLOGY, O FALLON, MO 633682205 (Tel: 8006472098)

📍

Updated Business Mailing Address April 25, 2024

Registered at PO BOX 60352, SAINT LOUIS, MO 631600352 (Tel: 8006472098)

📍

Updated Practice Location December 19, 2023

Registered at 1255 GRAHAM RD STE 101, FLORISSANT, MO 630318014 (Tel: 3148206800)

👤

Provider Name / Credentials Updated December 19, 2023

Recorded as OLIVIA HASSELFELD, PA

📍

Updated Business Mailing Address September 22, 2023

Registered at 660 S EUCLID AVE, MSC 8056-507-01, SAINT LOUIS, MO 631101010 (Tel: 8006472098)

📍

Updated Practice Location January 09, 2023

Registered at 2 PROGRESS POINT PKWY, DIV IM MEDICAL ONCOLOGY, O FALLON, MO 633682205 (Tel: 8006472098)

📍

Updated Business Mailing Address January 09, 2023

Registered at 660 S EUCLID AVE, CB 8056, SAINT LOUIS, MO 631101010 (Tel: 3147471171)

👤

Provider Name / Credentials Updated January 09, 2023

Recorded as OLIVIA LANGLEY, PA

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) January 09, 2023

Physician Assistant (License #2020026369 in MO)

📍

Updated Practice Location December 09, 2022

Registered at 1255 GRAHAM RD STE 101, FLORISSANT, MO 630318014 (Tel: 3148206800)

📍

Updated Business Mailing Address December 09, 2022

Registered at 660 S EUCLID AVE, SAINT LOUIS, MO 631101010 (Tel: 3148206800)

✅

NPI Profile Active July 27, 2020

NPI status registered as active in NPPES database

📍

Updated Practice Location July 27, 2020

Registered at 507 KENILWORTH LN, BALLWIN, MO 630112433 (Tel: 4178185616)

📍

Updated Business Mailing Address July 27, 2020

Registered at 507 KENILWORTH LN, BALLWIN, MO 630112433 (Tel: 4178185616)

👤

Provider Name / Credentials Updated July 27, 2020

Recorded as OLIVIA LANGLEY, PA-C

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 27, 2020

Physician Assistant (License #085.007851 in IL)

🟢

Initial NPI Registration & Enumeration July 27, 2020

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1194334094

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: July 27, 2020

Last Update: April 17, 2025

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 7412011

Chicago, IL 606742011

Phone: 8006472098

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.