Dr. Amber Kristy Williams, DO

  • Northridge, CA
  • Hospitalist
NPI1124279088PAC ID1557553773
Medicare services, 2024
516
Medicare patients, 2024
181
Part D claims, 2024
79
MIPS score, 2024
100
Hospital affiliations
2
Practice address
18300 Roscoe Blvd, Northridge, CA 91325
Practice phone
Call (818) 885-8500
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Dignity Health - Northridge Hospital Medical Center

Hospital · Northridge, California

See all 5 affiliations

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Dr. Amber Kristy Williams is a hospitalist in Northridge, California

Dr. Williams practices at Dignity Health - Northridge Hospital Medical Center in Northridge, California, part of CommonSpirit Health.

Dr. Williams' NPI, 1124279088, was assigned on October 8, 2008. Dr. Williams holds California license 20A11145.

NPI and contact details
Medicare PAC ID
1557553773
NPI enumeration date
October 8, 2008
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(818) 885-8500
Professional email
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Personal email
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Mobile number
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Sex
Female
Estimated age
44
Medical school graduation
2008

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Amber Kristy Williams practices at Dignity Health - Northridge Hospital Medical Center in Northridge, California

Dr. Williams' primary practice is Dignity Health - Northridge Hospital Medical Center, at 18300 Roscoe Blvd, Northridge, CA 91325 in Los Angeles County. The practice phone is (818) 885-8500.

Source: Dmand AI Affiliation Data

Dr. Amber Kristy Williams is affiliated with 4 sites of care and 1 medical group

Dr. Williams' primary practice is Dignity Health - Northridge Hospital Medical Center in Northridge, California, part of CommonSpirit Health. The medical group on file is Mercy Medical Group. Dmand AI also links Dr. Williams to 1 more hospital, 1 group practice or clinic and 1 home health agency, each named with a free account.

See all 5 affiliations for Dr. Williams

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Amber Kristy Williams' practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 4 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Dignity Health - Northridge Hospital Medical CenterAvailable with a free account
+3 more affiliated sitesAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Amber Kristy Williams is one of 3,186 hospitalists in California

Hospitalist is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Williams is board certified in family medicine by the American Board of Family Medicine. Dr. Williams is licensed in California.

Specialties and state licenses

  • Hospitalist, CaliforniaPrimaryLicense 20A11145 · taxonomy 208M00000X

Hospitalists near Dr. Williams

Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Amber Kristy Williams billed Medicare for 516 services in 2024

CMS data shows 516 Medicare services from Dr. Williams across 4 procedure codes in 2024, for 181 Medicare patients. Medicare paid $49,710 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024516
Medicare patients181
Paid by Medicare$49,710
Procedure codes4

Dr. Williams' Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 4732024: 5169%

Dr. Williams compared with the California median for hospitalists, 2024

  • Dr. Williams
  • California median
Medicare services
516vs 43020% above
Medicare patients
181vs 20110% below
Part D claims
11vs 6984% below

Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.

Dr. Williams' most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Williams

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Amber Kristy Williams treated 181 Medicare patients in 2024, average age 74

CMS counts 181 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 63 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 73% are also on Medicaid. Their average risk score is 3.07, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 65, with 45% women.

Medicare patients, 2024181
Average age74
Average risk score3.07
Also on Medicaid73%

Dr. Williams' Medicare patients by age, 2024

Dr. Williams' Medicare patients by sex, 2024

  • Women9552%
  • Men8648%

Chronic conditions among Dr. Williams' Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Ischemic heart disease66%
  4. Arthritis61%
  5. Diabetes61%
  6. Heart failure58%
  7. Chronic kidney disease55%
  8. Mood disorders48%

Share of Medicare patients with each condition. A patient can have several.

Dr. Williams' patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 65

Patient panel by sex, all payers

  • Women45%
  • Men54%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Amber Kristy Williams wrote 79 Medicare Part D claims in 2024

In 2024, Dr. Williams wrote 79 Medicare Part D claims for 36 patients. 89% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $235 in total drug cost. In 2022, CMS named 14 claims across 1 drug.

Part D claims, 202479
Drugs named by CMS1
Total drug cost$235
Part D patients36

Dr. Williams' Part D claims by kind of drug, 2024

  • Generic70 claims89%
  • Brand-name and other9 claims11%

Dr. Williams' most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Dr. Williams' Part D claims, 2024

  • Antibiotics16%13 of 79 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2022 to 2024

  • 2022
  • 2024
Claims for drugs CMS names
2022: 142024: 1121%

Drugs named by CMS: 1 in 2024, 1 in 2022.

See all prescribing by Dr. Williams

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Amber Kristy Williams scored 100 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Williams for performance year 2024, reported through an alternative payment model (APM). Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Accepts Medicare assignment
Yes

Dr. Williams' MIPS scores, performance year 2024

  • 100of 100Final score
  • 86.3of 100Quality
  • 100of 100Promoting Interoperability
  • 40of 100Improvement Activities

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026

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Dr. Amber Kristy Williams received $32 in industry payments from 2017 to 2019

CMS Open Payments shows 2 general payments to Dr. Williams from 2 drug and device companies from 2017 to 2019. Food and beverage make up the largest share, 100% of the total. Intercept Pharmaceuticals, Inc. paid the most, $19.

General payments to Dr. Williams by program year, 2017 to 2019

Companies that paid Dr. Williams the most, 2017 to 2019

Share is of all general payments to this clinician.

See all payments to Dr. Williams

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Amber Kristy Williams is board certified in family medicine

  1. Board certified in family medicineAmerican Board of Family Medicine

Source: Dmand AI Professional Profile Data

Sources for Dr. Amber Kristy Williams's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Amber Kristy Williams

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. Amber Kristy Williams' NPI number?

Dr. Amber Kristy Williams' NPI number is 1124279088. It was assigned on October 8, 2008, and it is active in the NPI Registry.

What kind of doctor is Dr. Amber Kristy Williams?

Dr. Amber Kristy Williams is a hospitalist in Northridge, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).

Where does Dr. Amber Kristy Williams practice?

Dr. Williams practices at 18300 Roscoe Blvd, Northridge, CA 91325. Dr. Williams' primary practice is Dignity Health - Northridge Hospital Medical Center in Northridge, California, part of CommonSpirit Health. Dmand AI also links Dr. Williams to 1 hospital, 1 group practice or clinic and 1 home health agency.

What is Dr. Amber Kristy Williams' office phone number?

The practice phone on file for Dr. Williams is (818) 885-8500.

What is Dr. Amber Kristy Williams' medical license number?

Dr. Williams holds California license 20A11145.

Which hospitals is Dr. Amber Kristy Williams affiliated with?

Dr. Williams practices at Dignity Health - Northridge Hospital Medical Center in Northridge, California. Dmand AI links Dr. Williams to 1 more hospital.

What medical group is Dr. Amber Kristy Williams part of?

Dr. Williams is linked to Mercy Medical Group.

Does Dr. Amber Kristy Williams accept Medicare?

Yes. CMS data shows Dr. Williams billed Medicare for 516 services in 2024, and Dr. Williams accepts Medicare assignment.

What is Dr. Amber Kristy Williams' MIPS score?

Dr. Williams' MIPS final score for performance year 2024 is 100 out of 100, reported through an alternative payment model (APM).

How many Medicare patients does Dr. Amber Kristy Williams see?

CMS counts 181 Medicare patients who saw Dr. Williams in 2024, with an average age of 74.

Show 5 more questionsShow fewer questions

Is Dr. Amber Kristy Williams board certified?

Yes. Dr. Williams is board certified in family medicine by the American Board of Family Medicine.

What services does Dr. Amber Kristy Williams bill to Medicare?

In 2024, Dr. Williams' most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).

What drugs does Dr. Amber Kristy Williams prescribe most?

In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Famotidine.

Has Dr. Amber Kristy Williams received payments from drug or device companies?

CMS Open Payments shows $32 in general payments to Dr. Williams from 2 companies from 2017 to 2019. The largest total came from Intercept Pharmaceuticals, Inc.

How long has Dr. Amber Kristy Williams been practicing?

Dr. Williams graduated from medical school in 2008, 18 years ago.

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