Medical coder & health informatics

What does a medical coder & health informatics do?

A medical coder turns what doctors and nurses write in a patient's record into standard codes.

The codes describe diagnoses and procedures. Hospitals and clinics use them for billing, claims, audits and national health statistics.

Health informatics covers the data side. A health informatics officer or analyst looks after how clinical data is recorded in electronic medical records (EMR), checked, reported and shared. In Singapore, this work sits in hospitals, polyclinics, healthcare clusters, insurers and health technology teams.

You work with doctors, nurses, medical records staff, finance and billing teams, IT staff and quality managers. Some roles also send reports to researchers and the Ministry of Health (MOH).

What the work involves

• Read discharge summaries, clinic notes and test results, then assign diagnosis and procedure codes.
• Send queries to doctors when a note is unclear or missing detail needed for a code.
• Check coded records for errors, duplicates and missing fields before they go to billing or reporting.
• Pull and clean data from the EMR with SQL and Excel to build monthly reports.
• Update coding guidelines and train ward or clinic staff on documentation habits.
• Handle requests for patient data and check that each one follows hospital policy and data protection rules.

Back to top

Skills a medical coder & health informatics needs

Back to top

Medical coder & health informatics job description

We are hiring a medical coder and health informatics officer to code patient records accurately and keep clinical data reliable.

You will work from the EMR, apply ICD-10 coding rules, answer clinician queries and prepare reports for finance, quality and management teams. Experience with SQL and Excel is useful.

Responsibilities

• Assign ICD-10 diagnosis codes and procedure codes to inpatient and outpatient records.
• Select the principal diagnosis and record secondary conditions that affect care.
• Raise queries with clinicians when documentation is incomplete or conflicts with other notes.
• Audit samples of coded records and report error rates and common causes.
• Extract and clean EMR data using SQL and Excel for reports and dashboards.
• Check that coded data matches billing and claims records.
• Keep coding guidelines and internal reference notes up to date.
• Train clinicians and administrative staff on documentation that supports accurate coding.
• Handle patient data according to the Personal Data Protection Act (PDPA) and your organisation's policies.
• Support EMR upgrades by testing code lists, forms and reports.

Requirements

• Diploma or degree in health information management, health sciences, nursing, life sciences or a related field.
• Knowledge of medical terminology, anatomy and disease processes, often gained from clinical study or work.
• Training in ICD-10 coding, or experience coding in a hospital or clinic. Fresh graduates may be trained on the job.
• Working skill in Excel, and basic SQL for pulling and checking data.
• Familiarity with an EMR system, or the ability to learn one quickly.
• Attention to detail, and comfort raising questions with senior clinicians.

Back to top

Medical coder & health informatics career path

Most people start as a coder in a hospital or clinic, then move into auditing, data analysis or team management.

The steps below are common Singapore titles.

1. Medical coder (junior)

   Entry

   You code routine inpatient and outpatient records under supervision and learn the organisation's documentation habits.

2. Medical coder

   Mid

   You code complex cases on your own, answer clinician queries and help check the work of newer coders.

3. Senior coder or health informatics analyst

   Senior

   You audit coded data, build reports with SQL and Excel, and advise on EMR changes.

4. Coding or health information team lead

   Lead

   You manage a team, set coding standards, plan training and report quality results to management.

5. Head of health information management

   Head

   You oversee coding, medical records and health data for an institution, and work with finance, IT and clinical leaders.

The titles are ones commonly used in Singapore; employers may name the levels differently.

Related jobs and their pay

Back to top

Medical coder & health informatics interview questions

We wrote these questions from the skills this job needs. They are not an official question bank.

1. How is an ICD-10 code structured, and how do you find the right one for a diagnosis?

   What a good answer covers

   • Describes the alphanumeric format and how characters add detail
   • Starts from the main term in the alphabetical index, then checks the tabular list
   • Reads inclusion, exclusion and coding notes before settling on a code
   • Checks that the code matches the full documentation, beyond the diagnosis headline

2. How do you choose the principal diagnosis for an inpatient stay with several conditions?

   What a good answer covers

   • Defines it as the condition mainly responsible for the admission after study
   • Reads the whole record, including the discharge summary and test results
   • Separates secondary diagnoses that affected care from incidental ones
   • Raises a query when the record leaves the main reason unclear

3. A patient has diabetes with kidney complications. How do you code it, and what could go wrong?

   What a good answer covers

   • Looks for the documented link between the conditions before combining codes
   • Uses coding guidelines on combination codes and sequencing
   • Codes only a link the doctor has stated
   • Queries the clinician if the link is unclear

4. Write a SQL query to list the ten most common diagnosis codes in each department for one quarter.

   What a good answer covers

   • Joins the encounter and diagnosis tables on the right key
   • Filters by a date range on discharge or visit date
   • Groups by department and code, with a count
   • Ranks within each department using a window function or similar
   • Mentions checking for duplicate rows and null codes

5. You receive an Excel file of 5,000 coded records. How do you check it for errors before reporting?

   What a good answer covers

   • Looks for duplicate encounter numbers and blank required fields
   • Validates codes against the official code list with a lookup
   • Uses filters and pivot tables to spot odd patterns, such as a procedure with no matching diagnosis
   • Keeps the original file and records every change made

6. Describe how data moves from a clinician's note in the EMR to a coded record and then to a report.

   What a good answer covers

   • Explains that clinicians document care, then coders read the record after discharge or visit
   • Describes how codes are entered or imported into the EMR or a coding tool
   • Mentions the data checks before codes go to billing and reporting
   • Names points where errors enter, such as free text or missing fields

7. What does interoperability mean in health informatics, and why does it matter?

   What a good answer covers

   • Defines it as different systems exchanging and using data correctly
   • Mentions common standards such as HL7 or FHIR
   • Explains the value for patients who move between hospitals and clinics
   • Raises data mapping problems, such as different code lists or field names

8. How would you measure and improve the quality of coded data in a hospital?

   What a good answer covers

   • Suggests regular audits on a sample of records
   • Tracks accuracy, query rates and turnaround time
   • Finds patterns, such as one department with repeated errors
   • Feeds results back to coders and clinicians with training or template changes

1. A surgeon's note mentions a complication, but the discharge summary does not. What do you do?

   What a good answer covers

   • Holds off coding the complication from a single unclear mention
   • Checks other parts of the record, such as nursing notes and test results
   • Sends a clear, neutral query to the surgeon
   • Codes only after the documentation is confirmed, and records the query outcome

2. An audit shows 8% of records in one department have coding errors. How do you respond?

   What a good answer covers

   • Reviews the errors to find the most common type
   • Checks whether the cause is poor documentation, unclear guidelines or coder error
   • Shares findings with the department head and the coders
   • Sets up follow-up training and a re-audit to confirm improvement

3. A researcher asks you for a spreadsheet of patient diagnoses for a study. What steps do you take?

   What a good answer covers

   • Asks for the approval or authority that allows the data release
   • Shares only the fields the study needs
   • Removes or masks identifiers where the approval allows
   • Records who received the data and how it will be stored

1. Tell us about a mistake you found in your own work. What did you do?

   What a good answer covers

   • Describes a real error and how it was found
   • Explains how it was corrected and who was told
   • Shows what changed afterwards, such as a new checklist
   • Takes responsibility without blaming others

2. Describe a time you had to ask a senior person to clarify something. How did you handle it?

   What a good answer covers

   • Prepared the question with the specific record details
   • Kept the tone polite and respected the person's time
   • Followed up if there was no reply
   • Explains what the answer changed in the final result

1. How do you apply the Personal Data Protection Act (PDPA) and your organisation's policies when handling patient records?

   What a good answer covers

   • Accesses records only when the job requires it
   • Keeps patient details off personal email and messaging apps
   • Uses secure systems and locks screens when away
   • Reports a suspected data leak to the data protection officer straight away

2. How do coded diagnoses and procedures affect hospital billing and insurance claims in Singapore?

   What a good answer covers

   • Explains that codes support the bill and claim for each episode of care
   • Notes that errors can cause claim rejections or wrong charges
   • Understands that coding must reflect only what is documented
   • Mentions working with the billing team to resolve mismatches

Common questions about a medical coder & health informatics job

Sources