Liesl Wenzke Hartmann, M.A., CCC/SLP
Liesl Wenzke Hartmann, M.A., CCC/SLP is a provider specialising in Speech-Language Pathologist in San Francisco, CA, registered under NPI 1003043217. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in San Francisco, based on OpenStreetMap data collected Sep 1, 2026. Parking is available about 0.33 mi away. There is EV charging 0.32 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 535 ft away, served by Balboa Street & Arguello Boulevard. If you arrive early, there is a coffee shop 0.37 mi away.
Getting here and what is nearby
Restaurant Okina Sushi 331 ft ~2 min
776 Arguello Boulevard, San Francisco 94118
Th-Sa 17:30-21:00; PH closed
Transit Arguello Boulevard & Balboa Street 364 ft ~2 min
Grocery Arguello Market 380 ft ~2 min
782 Arguello Boulevard, San Francisco 94118
Mo-Sa 07:30-20:00; Su 07:30-19:00; PH closed
Coffee The Velo Rouge Cafe 403 ft ~2 min
798 Arguello Boulevard, San Francisco 94118
Mo-Th 07:00-14:00; Fr-Su 07:00-15:00
Transit Turk Street & Arguello Boulevard 510 ft ~2 min
Transit Balboa Street & Arguello Boulevard 535 ft ~3 min
Restaurant Tastebuds 0.20 mi ~5 min
Restaurant Muguboka 0.22 mi ~5 min
401 Balboa Street, San Francisco 94118
Mo,We-Th 16:30-21:00; Tu off; Fr-Sa 11:30-21:00; Su 12:00-21:00
Coffee Mew Tea 0.23 mi ~5 min
Parking 0.30 mi ~7 min
Parking 0.31 mi ~7 min
EV charging 0.32 mi ~7 min
Convenience ExtraMile 0.33 mi ~7 min
3675 Geary Boulevard
Parking 0.33 mi ~7 min
Grocery Safeway 0.33 mi ~7 min
735 7th Avenue, San Francisco 94118
Mo-Su 06:00-24:00
Gas station Chevron 0.34 mi ~7 min
Convenience Stardust Market 0.35 mi ~7 min
3801 Geary Boulevard, San Francisco 94118
Coffee Little Sweet 0.37 mi ~8 min
3836 Geary Boulevard, San Francisco 94118-3211
Fr-Sa 11:00-23:00; Su-Th 11:00-22:00
Convenience M&K Market 0.43 mi ~9 min
1701 Anza Street
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 |
|---|---|---|
| 12920 | CA | Speech-Language Pathologist primary |
This provider holds licence 12920 issued in CA. 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 | 1003043217 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jun 15, 2009 |
| Last updated | Jun 15, 2009 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | M.A., CCC/SLP |
| Practice address |
672 2ND AVE San Francisco, CA 94118 (415) 310-6269 |
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 | 0 | 4 | 3 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 4 | 6 | 2 | 2 |
Sum = 43 · next multiple of 10 = 50 · 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.