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DR. RILEY AARON LAMB M.D.
NPI 1588815641
Surgery in Pierre, SD

Active since October 08, 2008PECOS EnrolledAccepts Medicare Assignment

NPPES record last updated: April 1, 2014. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Riley Aaron Lamb M.d. NPPES

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

DR. RILEY AARON LAMB M.D. (NPI 1588815641) is an individual surgery provider in Pierre, South Dakota, licensed in South Dakota (8931) and active in the NPI registry since October 2008. He is enrolled in Medicare PECOS, is affiliated with Avera St Mary's Hospital, and is a graduate of Other (2008).

NPPES Registry Identity

NPI1588815641
Entity TypeIndividualMale
Primary Taxonomy208600000X
Provider Legal NameDR. RILEY AARON LAMBCredential: M.D.
Location Address100 MAC LNPierre, SD 57501-3391
Mailing Address100 Mac LnPierre, SD 57501-3391 · (605) 224-5901
Phone(605) 224-5901
Sole ProprietorYes
Medical School CMSOtherGraduated 2008
Enumeration DateOctober 8, 2008
Last NPPES UpdateApril 1, 2014
✔ NPI 1588815641 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in SD · 8931
Definition
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
100 MAC LN, Pierre, SD 57501
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Avera Health Plans, Oscar Insurance Company, Wellmark of South Dakota, Inc..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. Riley Aaron Lamb 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 ID1850527227
PECOS Enrollment IDI20131114000324
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

2

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

Avera St Marys
0.1 mi
Emergency Medicine
801 E SIOUX AVE
Pierre, SD 57501
  • Reassigned Medicare billing, South Dakota enrollment
  • 197 clinicians in this Medicare group
NPI 1073305496 (605) 224-3100
Avera Gettysburg
49 mi
Critical Access
606 E GARFIELD AVE
Gettysburg, SD 57442
  • Reassigned Medicare billing, South Dakota enrollment
  • Also billed through NPI 1366091357 (South Dakota)
  • 39 clinicians in this Medicare group
NPI 1003887266 (605) 765-2480

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 8

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
100 services83 patients
Biopsy of large bowel using a flexible endoscope 45380
A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
84 services84 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
50 services50 patients
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
32 services32 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.
28 services28 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 services16 patients

Hospital Affiliations CMS Care Compare 3

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

Avera St Mary's Hospital

Acute Care Hospitals · Pierre, SD
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number430015
Location801 E SiouxPierre, SD 57501 · Hughes County
Emergency services Birthing friendly

Avera Mckennan Hospital & University Health Center

Acute Care Hospitals · Sioux Falls, SD
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number430016
Location1325 S Cliff AveSioux Falls, SD 57117 · Minnehaha County
Emergency services Birthing friendly

Avera Missouri River Health Center

Critical Access Hospitals · Gettysburg, SD
OwnershipVoluntary non-profit - Private
CMS Certification Number431302
Location606 East GarfieldGettysburg, SD 57442 · Potter County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 57501 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
$85.21 typical visit price
range $55.52 – $167.23
Typical copayment $21.30 (range $13.88 – $41.80)
Most-billed visit code 99203
Established Patient
$69.20 typical visit price
range $18.08 – $137.08
Typical copayment $17.30 (range $4.52 – $34.27)
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.

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.

AVERA MEDICAL GROUP
Physician Assistant
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 224-5901
DANIELLE CAMPBELL FNP
Nurse Practitioner (Family)
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 224-5901
DR. NICOLE MARIE POPPINGA M.D.
Pediatrics
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 945-5246
DR. DANIEL R RASMUSSEN DO
Physical Medicine & Rehabilitation
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 224-5901
JULIE ANN COX CNP
Nurse Practitioner (Family)
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 224-5901
ERICKA LESLIE PETERSEN CNP
Nurse Practitioner (Family)
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 224-5901
DIAGNOSTIC TECHNICAL SERVICES LLC
Clinical Medical Laboratory
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 977-5000
AVERA MCKENNAN
Clinic/Center (Ambulatory Surgical)
100 MAC LN
PIERRE, SD 57501
Hughes County (605) 224-5901

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 Riley Lamb's NPI number?

The NPI number for Riley Lamb is 1588815641. It was assigned to this individual provider in the NPPES registry on October 8, 2008.

Where is Riley Lamb located?

Riley Lamb practices at 100 Mac Ln, Pierre, SD 57501. The listed phone number is (605) 224-5901.

What is Riley Lamb's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Riley Lamb enrolled in Medicare?

Yes. Riley Lamb 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 Riley Lamb's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Riley Lamb reassigns Medicare benefits to 2 organizations: Avera St Marys (Pierre, SD) and Avera Gettysburg (Gettysburg, SD). 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 Riley Lamb's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Riley Lamb accept?

Health plans from Avera Health Plans, Oscar Insurance Company and Wellmark of South Dakota, Inc. list Riley Lamb 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 Riley Lamb affiliated with any hospitals?

According to CMS data, Riley Lamb is affiliated with Avera St Mary's Hospital, Avera Mckennan Hospital & University Health Center and Avera Missouri River Health Center.

When was this NPI record last updated?

The NPPES record for Riley Lamb was last updated on April 1, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.