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DR. HASSAN ALI CHAHINE MD
NPI 1518326933
Internal Medicine in Downey, CA

Active since February 12, 2016PECOS EnrolledAccepts Medicare Assignment
8301 FLORENCE AVE STE 301, DOWNEY, CA 90240(866) 333-3158 Get Directions Write a Review

NPPES record last updated: February 26, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 6, 2023, Dec 19, 2019, Sep 6, 2018 and 1 more (4 updates tracked since 2016).

About Dr. Hassan Ali Chahine Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. HASSAN ALI CHAHINE MD (NPI 1518326933) is an individual internal medicine provider in Downey, California, licensed in California (A151005) and active in the NPI registry since February 2016. He is enrolled in Medicare PECOS and is a graduate of Other (2015).

NPPES Registry Identity

NPI1518326933
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. HASSAN ALI CHAHINECredential: MD
Location Address8301 FLORENCE AVE STE 301Downey, CA 90240-3948
Mailing Address8301 Florence Ave Ste 301Downey, CA 90240-3948 · (866) 333-3158
Phone(866) 333-3158
Sole ProprietorNo
Medical School CMSOtherGraduated 2015
Enumeration DateFebruary 12, 2016
Last NPPES UpdateFebruary 26, 20244 updates tracked since enumeration
NPPES CertifiedFebruary 26, 2024
✔ NPI 1518326933 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A151005
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
8301 FLORENCE AVE STE 301, Downey, CA 90240
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Hassan Ali Chahine Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID9739449521
PECOS Enrollment IDI20180216002001
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Hassan Chahine reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Galen Inpatient Physicians PC
4.6 mi
Hospitalist
309 W BEVERLY BLVD
Montebello, CA 90640
  • Reassigned Medicare billing, California enrollment
  • 962 clinicians in this Medicare group
NPI 1114703006 (323) 889-2499
Southern California Hospitalist Network Medical Group Inc
18 mi
Internal Medicine
625 THE CITY DR S STE 320
Orange, CA 92868
  • Reassigned Medicare billing, California enrollment
  • 187 clinicians in this Medicare group
NPI 1790880458 (714) 202-2330
Socal Physician Partners Apc
32 mi
Internal Medicine
23141 VERDUGO DR STE 201
Laguna Hills, CA 92653
  • Reassigned Medicare billing, California enrollment
  • 6 clinicians in this Medicare group
NPI 1679425532 (949) 000-0000
Hassan Chahine MD Inc
32 mi
Internal Medicine
23141 VERDUGO DR STE 201
Laguna Hills, CA 92653
  • Reassigned Medicare billing, California enrollment
  • 10 clinicians in this Medicare group
NPI 1245851815 (949) 215-5055

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
1,909 services232 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
341 services104 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
181 services57 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
153 services130 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
76 services71 patients
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308
A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.
53 services36 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90240 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Care Plan
Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker…
100%49 patients5/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 4

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
4 suppliers25 claims25 services$14.75 avg. paid by Medicare
Home ventilator, any type, used with non-invasive interface, (e.g., mask, chest shell) E0466
DME-Other DME · category DE005N
3 suppliers14 claims14 services$779.62 avg. paid by Medicare
Nebulizer, with compressor E0570
DME-Other DME · category DE000N
3 suppliers17 claims17 services$4.05 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
5 suppliers26 claims26 services$64.37 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

RENEE SMITH MD A PROFESSIONAL CORPORATION
Psychiatry & Neurology (Psychiatry)
8301 FLORENCE AVE STE 301
DOWNEY, CA 90240
Los Angeles County (562) 774-8074
DR. RENEE ELENA SMITH M.D.
Psychiatry & Neurology (Psychiatry)
8301 FLORENCE AVE STE 301
DOWNEY, CA 90240
Los Angeles County (562) 862-0604

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Hassan Chahine's NPI number?

The NPI number for Hassan Chahine is 1518326933. It was assigned to this individual provider in the NPPES registry on February 12, 2016.

Where is Hassan Chahine located?

Hassan Chahine practices at 8301 Florence Ave Ste 301, Downey, CA 90240. The listed phone number is (866) 333-3158.

What is Hassan Chahine's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Hassan Chahine enrolled in Medicare?

Yes. Hassan Chahine is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Hassan Chahine's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Hassan Chahine reassigns Medicare benefits to 4 organizations: Galen Inpatient Physicians PC (Montebello, CA), Southern California Hospitalist Network Medical Group Inc (Orange, CA), Socal Physician Partners Apc (Laguna Hills, CA) and Hassan Chahine MD Inc (Laguna Hills, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Hassan Chahine's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Hassan Chahine was last updated on February 26, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.