Active NPI
Rheumatology Associates, LLC
- Rheumatology Physician
- Chesterfield, MO
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Rheumatology Physician
- Legal business name
- RHEUMATOLOGY ASSOCIATES, LLC
- Practice address
- 224 S Woods Mill Rd Ste 270
Chesterfield, MO 63017-3513 - Phone
- (636) 685-7709
- Fax
- (314) 590-5958
- NPI assigned
- Sep 10, 2014
- Last updated
- Mar 5, 2026
- Organization subpart
- Yes
- Parent organization
- ST. LUKES MEDICAL GROUP
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Authorized official
- Name
- Darren Haskell, MD.
- Title
- Chief Medical Officer
- Phone
- (314) 205-6444
Authorized official NPPES reports the official by name only. The link goes to the one practitioner with that name whose NPPES practice address or phone number is this organization’s.
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Rheumatology Physician | 207RR0500X | Primary |
Addresses
Primary practice location
224 S Woods Mill Rd Ste 270
Chesterfield, MO 63017-3513
Mailing address
121 Saint Lukes Center Dr
Chesterfield, MO 63017-3518
Phone (636) 685-7804
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in MO
Enrollment records 1
National Provider Directory
National Provider Directory- Part of
- St Lukes Medical Group
Locations
5551 Winghaven Blvd
Ste 290
O Fallon, MO 63368
Phone (636) 561-6011
Ownership & related parties
Parent organization (reported in NPPES) 1
This organization reports itself as a subpart in NPPES; the parent’s legal name matches this organization in the same state.
-
- Family Medicine Physician
- Chesterfield, MO
- NPI 1215308945
Practitioners & affiliated clinicians
Practitioners 2
Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.
-
- Rheumatology Physician
- Chesterfield, MO
- NPI 1265455547
-
- Internal Medicine Physician
- Chesterfield, MO
- NPI 1689636813
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1410307200000",
"enumeration_type": "NPI-2",
"last_updated_epoch": "1772668800000",
"number": "1326449232",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "121 SAINT LUKES CENTER DR",
"city": "CHESTERFIELD",
"state": "MO",
"postal_code": "630173518",
"telephone_number": "636-685-7804",
"fax_number": "314-576-2344"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "224 S WOODS MILL RD STE 270",
"city": "CHESTERFIELD",
"state": "MO",
"postal_code": "630173513",
"telephone_number": "636-685-7709",
"fax_number": "314-590-5958"
}
],
"practiceLocations": [],
"basic": {
"organization_name": "RHEUMATOLOGY ASSOCIATES, LLC",
"organizational_subpart": "YES",
"parent_organization_legal_business_name": "ST. LUKES MEDICAL GROUP",
"enumeration_date": "2014-09-10",
"last_updated": "2026-03-05",
"certification_date": "2026-03-05",
"status": "A",
"authorized_official_last_name": "HASKELL",
"authorized_official_first_name": "DARREN",
"authorized_official_title_or_position": "CHIEF MEDICAL OFFICER",
"authorized_official_telephone_number": "314-205-6444",
"authorized_official_credential": "MD."
},
"taxonomies": [
{
"code": "207RR0500X",
"taxonomy_group": "193400000X SINGLE SPECIALTY GROUP",
"desc": "Internal Medicine, Rheumatology",
"state": null,
"license": null,
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}
Other providers in Chesterfield, MO
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 5, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.