Stella Hartono, MD PHD
NPI 1588195457 · Allergy & Immunology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stella Hartono, MD PHD is a Allergy & Immunology Physician provider in Stanford, CA (NPI 1588195457).
Provider details
- NPI number
- 1588195457
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD PHD
- Sex
- Female
- Sole proprietor
- No
- License
- A198890 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
86 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 31 | $93 |
| Test to Measure the Level of Nitric Oxide Gas95012 | 22 | $20 |
| Test to Measure Expiratory Airflow and Volume94010 | 21 | $29 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 12 | $16 |
Typical Medicare-allowed amounts for these services range $16–$93 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$502 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 7471 N Fresno StFresno, CA 93720-2457Phone: (626) 506-0262
- 725 Welch RdPalo Alto, CA 94304-1601Phone: (650) 497-8000
Registry dates
- Enumerated
- 2017-03-23
- Last updated
- 2026-01-09
- Certified
- 2026-01-09
Frequently asked questions
- What is Stella Hartono's NPI number?
- Stella Hartono's National Provider Identifier (NPI) is 1588195457, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stella Hartono's specialty?
- Stella Hartono is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Stella Hartono located?
- Stella Hartono's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Stella Hartono's phone number?
- The practice phone number listed in the NPPES registry for Stella Hartono is (650) 723-4000.
- Does Stella Hartono accept Medicare?
- Stella Hartono is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stella Hartono's NPI active?
- Yes — Stella Hartono's NPI (1588195457) is active in the NPPES registry as of the last update on 2026-01-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.