Doctor profile · Federal record
Dr. John Nienow, MD
Infectious Disease Physician (CMS: Internal Medicine) · San Francisco, CA
- NPI 1861472649
- Accepts Medicare
- 38 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
2186 Geary Blvd Ste 314
San Francisco, CA 941153457
(415) 202-1550
fax (415) 776-8233 - Additional location
-
558 Clayton St, Pssb G500
San Francisco, CA 941172907
(415) 746-1950
fax (415) 431-9909
Credentials & registration
- NPI registered
- January 2006 — 20 yrs on file
- Profile last updated
- May 6, 2025
- Year of graduation
- 1988 — 38 yrs since
- Specialty taxonomy
- 207RI0200X — NUCC code
- State license (1)
- California #00G795490
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1861472649. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
715
Distinct HCPCS
4
Medicare allowed
$126,021
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 333 | 155 | $150 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 330 | 124 | $210 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 27 | 27 | $107 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 25 | 25 | $153 |
In context: peer comparison
Among 19 peers in San Francisco Infectious Disease Physician, average services per provider: 69. This provider delivers 10× the peer median.Open Payments
Industry payments received
All-time total
$6,532
Transactions
81
Manufacturers
4
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Gilead Sciences, INC. | 24 | $5,598.20 | |
| Emd Serono, INC. | 32 | $576.31 | |
| ViiV Healthcare Company | 24 | $336.21 | |
| Theratechnologies INC. | 1 | $21.07 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
3,630
Patients
713
Total drug cost
$4,226,214
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Biktarvy (Bictegrav/Emtricit/Tenofov Ala) | Brand | 534 | 58 | $2,353,758 |
| Atorvastatin Calcium | Generic | 533 | 125 | $7,445 |
| Bupropion Xl (Bupropion Hcl) | Brand | 228 | 39 | $8,786 |
| Lisinopril | Generic | 228 | 57 | $3,109 |
| Descovy (Emtricitabine/Tenofov Alafenam) | Brand | 223 | 24 | $557,469 |
| Tamsulosin Hcl | Generic | 222 | 57 | $6,768 |
| Tivicay (Dolutegravir Sodium) | Brand | 217 | 22 | $601,221 |
| Gabapentin | Generic | 216 | 40 | $4,295 |
| Amlodipine Besylate | Generic | 206 | 53 | $2,675 |
| Losartan Potassium | Generic | 197 | 57 | $2,571 |
Hospital affiliations
Frequently asked questions
What is Dr. John Nienow's medical specialty?
Dr. John Nienow practices Infectious Disease Physician in San Francisco, CA.
Where does Dr. John Nienow practice?
Dr. John Nienow practices at 2186 Geary Blvd Ste 314, San Francisco, CA 941153457. Office phone: 4152021550.
What is Dr. John Nienow's NPI?
Dr. John Nienow's National Provider Identifier (NPI) is 1861472649, issued by NPPES.
Does Dr. John Nienow accept Medicare assignment?
Yes. Dr. John Nienow accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Nienow commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99215); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.