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Edit this profileAt a glance
- 1500 E Medical Center Dr, Ann Arbor, MI 48109
About Dr. Lok
Based in Ann Arbor, MI, Anna S. Lok, MD is listed in the NPI registry under gastroenterology. Anna is also listed as specializing in internal medicine. Medicare claims data shows Anna provided 210 services to 176 patients. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, measurement of liver stiffness, and 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'. NPI 1013090935 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (734) 936-4000
- Email not available
Practice Locations
1500 E MEDICAL CENTER DR
Ann Arbor, MI 48109
Conditions Commonly Evaluated or Treated
Within Gastroenterology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
Lower endoscopy
Upper endoscopy
Capsule and physiology testing
Diagnostic Testing
Liver procedures
Treatments
Procedures Most Often Billed to Medicare
210 services · 176 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Measurement of liver stiffness | Treatment | 91200 |
42 | More often than most peers in Gastroenterology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
65 | As often as other peers in Gastroenterology |
| 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' | Billing code | G2211 |
36 | As often as other peers in Gastroenterology |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
32 | As often as other peers in Gastroenterology |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
23 | As often as other peers in Gastroenterology |
| 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' | Billing code | G2211 |
12 | As often as other peers in Gastroenterology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other gastroenterologists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 30 related providers in 4 groups
Other gastroenterologists in Ann Arbor 7
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1977 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Measurement of liver stiffness 7
Providers in MI who bill this service to Medicare most often.
Common questions
What does Dr. Lok specialize in?
Dr. Lok is a gastroenterologist in Ann Arbor, MI. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where is Dr. Lok located?
Dr. Lok is listed at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Lok's phone number?
The number on file is (734) 936-4000. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Lok?
Dr. Lok's National Provider Identifier is 1013090935. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Lok go to medical school?
Dr. Lok attended Other, graduating in 1977. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Lok have?
Dr. Lok has 49 years experience. Calculated from a graduation year of 1977, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Lok do most often?
According to Medicare billing data, Dr. Lok provides treatments such as measurement of liver stiffness, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Lok's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Lok. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.