Margaret Walkenhorst
Margaret Walkenhorst is a provider specialising in Speech-Language Pathologist in Saint Louis, MO, registered under NPI 1003149907.
Getting there
Here is what surrounds this office in Saint Louis, based on OpenStreetMap data collected Sep 4, 2026. Parking is available about 0.31 mi away. The nearest transit stop is 818 ft away, served by Clayton at Skinker. If you arrive early, there is a coffee shop 0.34 mi away.
Getting here and what is nearby
Parking 175 ft ~1 min
Parking 200 ft ~1 min
Transit Clayton at DeMun 362 ft ~2 min
Hotel Cheshire Inn 355 ft ~2 min
Transit Clayton at DeMun 396 ft ~2 min
Restaurant Boundary 537 ft ~3 min
Restaurant Basso 581 ft ~3 min
Coffee Starbucks 695 ft ~3 min
Transit Clayton at Skinker 818 ft ~4 min
Restaurant Chinese Express 789 ft ~3 min
Gas station Stevenson's Hi-Pointe Service 863 ft ~4 min
Coffee Haché Herbal Infusions 0.25 mi ~6 min
6350 South Rosebury Avenue, Clayton 63105
We-Su 08:00-14:00
Parking 0.31 mi ~7 min
710 De Mun Avenue, Clayton 63105
Coffee Kaldi's 0.34 mi ~7 min
700 De Mun Avenue, Clayton 63105
Mo-Su 06:30-17:00
Grocery Schnucks 0.38 mi ~8 min
6600 Clayton Road, Clayton 63117
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 2009012810 | MO | Speech-Language Pathologist primary |
This provider holds licence 2009012810 issued in MO. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Speech-Language Pathologist covers
The speech-language pathologist is the professional who engages in clinical services, prevention, advocacy, education, administration, and research in the areas of communication and swallowing across the life span from infancy through geriatrics. Speech-language pathologists address typical and atypical impairments and disorders related to communication and swallowing in the areas of speech sound production, resonance, voice, fluency, language (comprehension and expression), cognition, and feeding and swallowing. NUCC Health Care Provider Taxonomy, code 235Z00000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003149907 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 9, 2009 |
| Last updated | Sep 9, 2009 |
| Status | Active |
| Sole proprietor | No |
| Gender | Female |
| Practice address |
12110 CLAYTON RD Saint Louis, MO 63131 (314) 989-8150 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 1 | 4 | 9 | 9 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 4 | 9 | 9 | 0 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.