DR. ROBERT NATHAN LONG M.D.
NPI 1639300262
Internal Medicine in Saint Louis, MO

Q: What is Robert Long's NPI number?

The NPI number for Robert Long is 1639300262. It was assigned to this individual provider in the NPPES registry on July 30, 2009.

Q: What is Robert Long's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Robert Long was last updated on December 21, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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 July 30, 2009PECOS EnrolledAccepts Medicare Assignment

621 S NEW BALLAS RD, SUITE 3016B, SAINT LOUIS, MO 63141(314) 251-6339(314) 251-4564 Get Directions Write a Review

NPPES record last updated: December 21, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Robert Nathan Long M.d. NPPES

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

DR. ROBERT NATHAN LONG M.D. (NPI 1639300262) is an individual internal medicine provider in Saint Louis, Missouri, licensed in Missouri (2012017791) and active in the NPI registry since July 2009. He is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Indiana University School Of Medicine (2012).

NPPES Registry Identity

NPI1639300262

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. ROBERT NATHAN LONGCredential: M.D.

Location Address621 S NEW BALLAS RD, SUITE 3016BSaint Louis, MO 63141-8232

Mailing Address621 S New Ballas Rd, Suite 3016bSaint Louis, MO 63141-8232 · (314) 251-6339 · Fax (314) 251-4564

Phone(314) 251-6339

Fax(314) 251-4564

Sole ProprietorNo

Medical School CMSIndiana University School Of MedicineGraduated 2012

Enumeration DateJuly 30, 2009

Last NPPES UpdateDecember 21, 2012

✔ NPI 1639300262 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in MO · 2012017791

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

621 S NEW BALLAS RD, Saint Louis, MO 63141

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan, Ambetter Health and more.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. Robert Nathan Long M.d. 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 ID7810140662

PECOS Enrollment IDI20130104000141

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 Robert Long reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mercy Hospitals East Communities

1.5 mi

Clinic/Center

615 S NEW BALLAS RD
Saint Louis, MO 63141

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

NPI 1851431738 (314) 251-6382

Mercy Clinic Adult Hospitalists - St. Louis, LLC

1.5 mi

Internal Medicine

621 S NEW BALLAS RD, SUITE 3016-B
Saint Louis, MO 63141

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

NPI 1841235108 (314) 251-6339

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 5

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

372 services133 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

106 services105 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

72 services71 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

27 services18 patients

Aspiration of fluid from chest cavity using imaging guidance 32555

This procedure, known as a thoracentesis, involves removing fluid from the space between the lungs and chest wall, called the pleural space. It's performed under imaging guidance to ensure precision. It can help diagnose conditions or relieve symptoms like shortness of breath.

12 services11 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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63141 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

$128.28 typical visit price

range $55.65 – $169.38

Typical copayment $32.07 (range $13.91 – $42.34)

Most-billed visit code 99204

Established Patient

$98.37 typical visit price

range $17.76 – $137.92

Typical copayment $24.59 (range $4.44 – $34.48)

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 20

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

STEPHANIE LYNN SHOREY WHNP-BC

Nurse Practitioner (Women's Health)

621 S NEW BALLAS RD, SUITE 2007B
SAINT LOUIS, MO 63141

St. Louis County (314) 991-5000

DR. KATHRYN BOTNEY M.D.

Obstetrics & Gynecology

621 S NEW BALLAS RD, SUITE 4005
SAINT LOUIS, MO 63141

St. Louis County (314) 567-5016

HUILIN LI M.D.

Internal Medicine

621 S NEW BALLAS RD, SUITE 3016B
SAINT LOUIS, MO 63141

St. Louis County (314) 251-6339

LUIS A GIUFFRA LLC

Psychiatry & Neurology (Psychiatry)

621 S NEW BALLAS RD, SUITE 398A
SAINT LOUIS, MO 63141

St. Louis County (314) 251-7720

JOSEPH G HERRMANN MD LLC

Specialist

621 S NEW BALLAS RD, SUITE 419A
SAINT LOUIS, MO 63141

St. Louis County (314) 432-0056

KAREN KILO RN, CDE, RD

Nutritionist (Nutrition, Education)

621 S NEW BALLAS RD, SUITE 460A
SAINT LOUIS, MO 63141

St. Louis County (314) 251-4330

KATINA M CANDEE PA-C

Physician Assistant

621 S NEW BALLAS RD, SUITE 483A
SAINT LOUIS, MO 63141

St. Louis County (314) 251-2095

DR. PETER KONG-WOO YOON M.D.

Specialist

621 S NEW BALLAS RD, STE 297A
SAINT LOUIS, MO 63141

St. Louis County (314) 251-6364

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 Robert Long's NPI number?

The NPI number for Robert Long is 1639300262. It was assigned to this individual provider in the NPPES registry on July 30, 2009.

Where is Robert Long located?

Robert Long practices at 621 S New Ballas Rd Suite 3016B, Saint Louis, MO 63141. The listed phone number is (314) 251-6339.

What is Robert Long's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Robert Long enrolled in Medicare?

Yes. Robert Long 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 Robert Long's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Robert Long reassigns Medicare benefits to 2 organizations: Mercy Hospitals East Communities (Saint Louis, MO) and Mercy Clinic Adult Hospitalists - St. Louis, LLC (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 Robert Long's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Robert Long accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 2 other insurers list Robert Long 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 Robert Long affiliated with any hospitals?

According to CMS data, Robert Long is affiliated with Mercy Hospital St Louis.

When was this NPI record last updated?

The NPPES record for Robert Long was last updated on December 21, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.